I don't recommend investing for now (too many investing related scams baka itakbo lang yan). try to be hands on money related things.
business venture may be a good idea. ex. opening a meat shop or small business.
kung ako may 20k iinvest ko muna sa sarili ko buy courses, books. Lahat ng pde mo pagkakuhaan ng bagong skills dun mo ilahay, diko sinasabi ubusin mo yung 20k. Then after nyan malalaman mo na ano niche mo.