[ssss11]

I think it depends what type of side projects you’d like to create.

A few thoughts:

1. For web sites and web apps it would be good to learn a popular front end (react or vue, webpack or other build process) and/or backend (node.js or php)

2. For crypto/web3 ideas you could learn solidity to create ethereum smart contracts, along with truffle and other tools used - google for tutorials.

3. Always handy to learn about the various aws services (or gcp/azure), heroku etc.. you could learn these while you setup your project

I think most important is thinking about the type of project as that will lead you to languages I think. GitHub has a great deal of example projects to clone and try out, also find tutorials.

Good luck!