Introduction to COBOL
Still running the world’s financial systems.
What COBOL is, why it matters, and how to navigate this track.
COBOL is a programming language. Still running the world’s financial systems.
What is COBOL?
COBOL is a programming language used across modern software. Still running the world’s financial systems.
This track introduces COBOL from first principles, then goes deeper through the Deep, Reference, and Cheatsheet tabs.
Why learn COBOL?
- COBOL is widely used in industry and worth understanding well.
- Each topic pairs a clear explanation with hands-on examples.
- You can revisit any concept in the Reference tab or grab the Cheatsheet for quick recall.
Where it is used
- Application development
- Scripting & automation
- Backend systems
How this track works
Every topic here has four views, switchable with the tabs at the top of each page:
- Learn — the clear, practical walkthrough you are reading now.
- Deep — every detail: edge cases, the full API, and what is really happening.
- Reference — a scannable, no-fluff lookup for when you already know the shape.
- Cheatsheet — the one-page summary, printable, for quick recall.
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h1 through h6 are the page’s table of contents. Use them for structure, never for size — that’s what CSS is for.
HTML Headings
h1–h6 are instances of HTMLHeadingElement. They take no special attributes — only the global set and ARIA — but there’s real depth in how they form the document outline and what you can do with them from JavaScript.
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