Complete equal yes all aminos think, meat, fish, dairy, things that walk, fly or swim or come from them like eggs, milk
incomplete missing aminos so if it were your only significant source your body would steal that from somewhere as needed
yes, rice/beans, oats / buckwheat, buckwheat and most grains.
easiest thing make sure you have a complete source i dont even count beans rice etc
I think beans & rice need cheese to be complete because rice is so low in protein. As a rule though, whole grains + legumes = complete protein. It’s obviously not of the quality of whey though.
To the OP, if you are vegetarian just get a list of grains and legumes and put 2 & 2 together.
If you really like this stuff take an entry level nutrition course at a community college, it’s really good.