Self taught alert! I haven't gotten into fermentation of food waste yet, which would be very effective. But I make my own liquid fertilizer from food waste by passing it through the digestive system of maggots. Although this isn't very "bio available" because of more "complex" biomolecules, I have been getting fantastic results so far with greens, beans, cabbages, etc.

I followed the following [0] video for making a simple liquid fertilizer setup using 2 paint buckets (not in English but easy to follow). The advantage IMO is that risks associated with things like overfertilisation are minimised.

[0] https://youtu.be/7vEpf20_9dA