Incredibly rewarding to give back to the Earth. If you are lucky enough to have a backyard, you likely find an easy compost system that works for you. Hopefully your big city has one too.
A lot of information about compost is very focused on efficiency. But really all you need to do is have a pile of fruit & vegetable trash (no dairy no meat) that you mix half and half with dry materials (compostable carry out, recycled brown paper bags, grass or leaf litter, etc.). We use little home compostable trash bags to discourage non-insect animals from partaking. Stir and then water the pile once in a while and watch your yard (and surrounding yards) come back to life.