Which food groups are considered good sources of complete proteins?

meat because it is a really good source of protein

As a vegan i would recommend legumes such as lentils, beans, nuts and peas. if you are still a meat eater try to lower your income of meat and try to cut out red meat and pork as those are labeled carcinogenic foods meaning its like the same thing as smoking.

It is false that oils and fats play an essential role in a healthy died and you should eat approximately 12 teaspoons a day. Whereas the first part of this sentence is true, oils and fats are indeed important for our bodies as they give us strength and proteins, the other part is incorrect. 12 teaspoons is way too much for daily intake, you should take up to 6 teaspoons.