Free and low-bandwidth resources for learning to code

Connectivity and cost are real constraints, so here's a list that respects both.

Mostly text (light on data):

• The Odin Project — full web-dev curriculum, free.
• MDN Web Docs — the reference for HTML, CSS, JS.
• freeCodeCamp — interactive, works on modest connections.

Offline-friendly tips:

• Download docs and tutorials when you have good wifi, read them later.
• Use Kiwix to keep entire sites (like Stack Overflow) offline.

Add your own finds below — especially anything that works well on metered mobile data.