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Topic archive
13 articles tagged with “fundamentals”
Reading index
13 of 13 articles
01
7 min
Practical techniques for explaining code in Python, JavaScript, and any language, whether you're onboarding a teammate, writing docs, or just trying to understand a confusing function yourself.
02
8 min
A practical guide to understanding legacy codebases with no documentation, unclear ownership, and years of accumulated decisions. Learn how to map, trace, and safely modify old code.
03
8 min
Learn systematic debugging techniques that experienced developers use to find and fix bugs faster.
04
8 min
A beginner-friendly introduction to TypeScript. Learn why types help you write better code and how to get started.
05
7 min
Learn what clean code really means and the practical principles that make code readable, maintainable, and professional.
06
6 min
Understanding cyclomatic complexity, cognitive complexity, and why simpler code is better code.
07
5 min
Learn proven strategies for understanding unfamiliar codebases. From finding entry points to tracing data flow, become faster at reading other people's code.
08
6 min
Master async/await in JavaScript. Understand promises, handle errors properly, and avoid common pitfalls with practical examples.
09
5 min
Learn Big O notation without the math degree. Understand O(1), O(n), O(n²) and why it matters for your code with real examples.
10
5 min
A practical Git reference with the commands developers use daily. Copy-paste ready examples for commits, branches, merges, and fixing mistakes.
11
6 min
Recursion explained simply. Learn the mental model, see the common patterns, and know when to use it, and when not to, in your own code.
12
6 min
REST APIs explained in simple terms. Understand endpoints, HTTP methods, status codes, and how web services communicate.
13
6 min
Understand technical debt: what causes it, how to identify it, when to pay it down, and how to communicate it to non-technical stakeholders.
Topic guide
Strong fundamentals make everything else easier. These articles cover variables, control flow, data types, functions, and core concepts every developer should understand deeply.
Frameworks change every few years, but fundamentals last an entire career. Variables, types, control flow, and functions are the vocabulary behind every language and every library. Developers who understand them deeply learn new tools faster, debug unfamiliar code with less effort, and write solutions that hold up over time.
If you are just starting out, these articles give you the strongest possible foundation to build on. If you are experienced, they offer a fresh lens on concepts you may take for granted. Either way, revisiting the basics is one of the best investments you can make in your long-term growth as a developer.
Pick a language and work through the basics: variables, data types, conditionals, loops, and functions. Write short programs that use each concept. Our articles cover these topics with clear examples and explanations that avoid unnecessary jargon. Once the basics feel solid, try combining them: write a function that loops through an array and returns a filtered result. Paste your practice code into ExplainThisCode for instant feedback on what each line does and how to improve it.
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