If you have free time, you could try to build an (offline) app that you or someone near you might need. It is good fun to find a user and build features for the

If you have free time, you could try to build an (offline) app that you or someone near you might need. It is good fun to find a user and build features for them. Other comments have great pointers for downloading docs/books/resources offline. Also textbooks are underrated.