That's a nice start. I guess you won't have many problems when you tried to learn about C (which is used for Bitcoin Core development afaik). Have you decided which part of development you wanted to contribute on? If you're expert on JavaScript & PHP maybe building block explorer can be a good learning experience for you.
Or if you want to educate people about Bitcoin & blockchain in general, building a website to explain about blockchain and things like that is also a great imo. You might not be a developer per se, but you help in the promotional/educational part.