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155 Best + Free Introduction to Computer Science Courses & Certificates [2026]
Ranked by Michael Kuhlman, CourseDuck's founder, from student reviews across every provider. How we rank
Our top picks
- The Art of Doing: Python Projects to Master the Fundamentals [Udemy]
- The Foundations of Computer Design [Udemy]
- Programming 101 [Udemy]
- AP Computer Science A - Java Concepts and Fundamentals [Udemy]
- The Ultimate beginners course for Computer Science or IT [Udemy]
- Computer Science And Programming Fundamentals [Udemy]
- AP Computer Science A 2025: Java Programming [Udemy]
- IT Fundamentals - Learn Python, SQL, HTML, Java & Computing [Udemy]
- Learn The Fundamentals of Programming: Core Concepts [Udemy]
- Programming Fundamentals in Java for CS Students: Part 1 [Udemy]
About the best Introduction to Computer Science courses
CourseDuck compares the 155 Introduction to Computer Science courses listed here from 4 providers, 73 of them free, and ranks them from the 104,000 ratings and reviews their students have left, with the price, length and level of each one side by side. No course pays to be listed or ranked. As featured on Harvard EDU, Stackify and Inc. How we rank
Frequently asked questions
- Udemy and Eduonix are best for practical, low cost and high quality Introduction to Computer Science courses.
- Coursera, Udacity and EdX are the best providers for an Introduction to Computer Science certificate, as many come from top Ivy League Universities.
- YouTube is best for free Introduction to Computer Science crash courses.
- PluralSight, SkillShare and LinkedIn are the best monthly subscription platforms if you want to take multiple Introduction to Computer Science courses.
- Independent Providers for Introduction to Computer Science courses & certificates are generally hit or miss.
Knowing a little computer science will help you understand the computers all around you. This isn't a how-to course for a particular piece of software, instead you will learn some fundamental concepts that you can apply to any software or computer system.
- Average
- $65,338 a year
- Middle half earn
- $40,000 to $95,500 25th to 75th percentile
- Full range
- $21,000 to $131,000
Share of US job postings in each pay band; the dark bar holds the average, the striped bars the 25th and 75th percentiles. Source: ZipRecruiter salary data, gathered when this guide was first published in October 2026.
Yes and No. Certified Introduction to Computer Science developers on average make more money. Having an Introduction to Computer Science certificate greatly increases the chance of landing an interview and can open otherwise closed doors. Coursera, Udacity and EdX offer excellent certificate options for impressing your future employers. Eduonix, Udemy and several other providers offer certificates, but they aren't as reputable. If you have a Computer Science Degree, certificates are not as important. Still, many employers won't care about certificates, but rather your interview skills, experience and/or skills assessment.
155 Filtered Courses
1
The Art of Doing: Python Projects to Master the Fundamentals (2025)
4.7
A learn-by-building Python course where every section ends in a project written from a PDF guide, taught by a high school teacher and rated 4.7 by over 1,000 students.
Best for: Complete beginners who want to write their own programs from the start rather than watch someone else code.
Pros
Cons
-
- Step-by-step PDF guides make students work out the logic before seeing the code
- A project at the end of every section, so nothing is learned without being used
- Reviewers say Eramo explains why things work instead of just showing what to type
- Updated September 2025, with 4.7 stars across more than 1,000 ratings
-
- Later app projects are hard to follow and some students could not get them running
- One low-star reviewer could not get help when projects broke
- Nearly 40 hours with no quizzes or coding exercises beyond the projects themselves
2
The Foundations of Computer Design (2017)
4.3
A two hour walk from binary numbers and logic gates to a small programmable MIPS style CPU, aimed at people who want to know what happens under the hood.
Best for: Programmers with some background who want the logic gates to CPU story told in one short sitting.
Pros
Cons
-
- Clear, logical progression from binary numbers to a working programmable CPU in about two hours
- Early sections on number systems and logic gates are praised as easy to follow
- Sections cover adders, latches, memory and MIPS assembly on the way to a final CPU design
- One reviewer with some background calls it a concise refresher he could finish in one sitting
-
- Later circuit lectures describe diagrams without highlighting or animation, and many students get lost
- No notes, slides, quizzes or downloadable resources, and no update since April 2017
- Dense for true beginners despite the beginner label; expect to rewatch and look things up
3
Programming 101 (2024)
4.6
A free four hour explainer of bits, memory, networking and what a programming language actually is, rated 4.6 by nearly 24,000 students who wanted the basics before writing code.
Best for: Complete novices, or self-taught coders, who want the hardware and networking picture before touching a language.
Pros
Cons
-
- Free, and short at 4.3 hours across 35 lectures, so it fits in a weekend.
- Reviewers say Turton explains binary, memory and networking with everyday examples that stick.
- Covers ground most coding courses skip: CPUs, packets, operating systems, licensing and DRM.
- Three caption tracks, and a Dutch reviewer says the subtitles and pace make it easy to follow.
-
- No quizzes, coding exercises or certificate, so it is watch-only.
- Published in 2016 and last updated July 2024; one recent reviewer asks for parts to be refreshed.
- Delivery can feel dry; a two star review calls the output boring.
4
AP Computer Science A - Java Concepts and Fundamentals (2026)
4.6
A sub-three-hour crash course covering the ten AP Computer Science A units in Java, with a quiz after every lecture and a practice test in the real exam format.
Best for: High school students who want a quick, quiz-heavy Java refresher before or during their AP CS A class.
Pros
Cons
-
- Follows the ten AP CS A units in order, so it maps directly onto the school curriculum
- 39 quizzes, 10 coding exercises and a final practice test in the real AP exam format
- One reviewer says the basics are explained more clearly than the College Board videos
- Updated January 2026, and the instructor offers Q&A help and optional 1-1 sessions
-
- Only 2.9 hours total, so it stays high-level; a three-star review wants more examples of actual code
- Low-star reviews call it boring or say the explanations are not in a good order
- English captions only, and 2D arrays get a single five-minute lecture
5
The Ultimate beginners course for Computer Science or IT (2025)
4.1
A hardware-first look at how computers actually work, from assembling a PC to building an adding circuit to assembly language, aimed at people who have never written code.
Best for: Absolute beginners who want to understand the hardware and the CPU before they ever write a line of code.
Pros
Cons
-
- Builds a PC, configures the BIOS and installs Linux and Windows in the first chapter
- Reviewers say the instructor is easy to understand and does not sugarcoat the material
- Building a circuit that adds two numbers and shows the result gives a concrete picture of what computing is
- Updated in February 2025, with 57 quizzes to check understanding along the way
-
- The seven-hour final section on CPU architecture and assembly loses some beginners
- Not a coding course; at least one student enrolled expecting programming and left disappointed
- Quiz-heavy pacing, which at least one reviewer found excessive
6
Computer Science And Programming Fundamentals (2018)
4.3
Computer Science and Programming Fundamentals . Must know Computer Science And Programming Knowledge .
What You'll Learn
- 1. To create important foundational knowledge base in computer science.
- 2. To gain knowledge about computer science fundamental concepts.
- 3. To Learn Basics of computer science and programming.
- 4. To gain practical knowledge about computer hardware and software
7
AP Computer Science A 2025: Java Programming
4.6
Master Java Programming Fundamentals and Succeed in AP Computer Science A
What You'll Learn
- Build a strong programming foundation
- Understand the fundamentals of Java programming
- Apply Java programming concepts
- Successfully prepare for the AP Computer Science A Exam
8
IT Fundamentals - Learn Python, SQL, HTML, Java & Computing (2024)
4.5
A Computer Course on IT Fundamentals; Coding in Python, SQL Databases, Web Development, Mobile App & Computer Science
What You'll Learn
- Learn 5 main areas of IT; Procedural Programming, Object Oriented Programming, Databases, Web Pages and Computer Science
- Learn to Program with coding in Python
- Learn Databases and SQL
- Learn Web Pages with HTML, CSS and PHP
- Learn Mobile Apps with JAVA
- Learn Computer Science
9
Learn The Fundamentals of Programming: Core Concepts (2024)
4.4
Learn the fundamentals of computer science for programming
What You'll Learn
- Understand how computer programming works
- Learn the fundamentals of Computer Science
10
Programming Fundamentals in Java for CS Students: Part 1 (2023)
4.9
Build a Strong Foundation in Computer Science through Java Programming
What You'll Learn
- Develop a deep understanding of core programming concepts, including data structures, algorithms, and fundamental principles of programming.
- Learn how to write clean, efficient code using best practices, ensuring your code is easy to read, maintain, and optimize.
- Study key Java concepts such as variables, loops, conditionals, arrays, and functions that apply to other programming languages
- Understand how to apply the principles learned in this course to other programming languages, making you a more versatile and adaptable programmer.
- Gain confidence in explaining complex programming concepts to others, enhancing your communication skills and professional credibility.
11
Coding Interview Jumpstart: Algorithms and Problem Solving (2018)
4.5
Learn the principles behind fundamental computer science algorihms asked on interviews for top tech companies.
What You'll Learn
- Having higher chances to get a job in a place where algorithmic problem solving is a part of interview.
- Have one more tool during coding interviews.
- Better understanding of principles behind fundamental computer science algorihms.
- Becoming a better problem solver.