Most of the things such as coffee ground, banana peels should all be composted as well as any of your kicthen scraps. As for egg shells, great source of CA, but they need to compost for about a year before that CA is avaliable to plants. I also garden using organic nutrients if you want to make a good compost tea to water into your plants try this. I use guano and fish mix (bio bizz, new product) I have a 4 gallon bucket that i fill with water and add in the correct amount of fish mix depending on how much i am making (for example i have a 40 gallon water barrel so i make my mix to 40 gallons) I put my guano and any other dry nutrients i might use into a piece of panty hose and seal it up drop it in the bucket. Last step use a fish tank air pump and air stones and run the mix of 24 hours then water into your garden. Very easy and simple way to add all nutrients at once.

green leaves