grammar - are there any concrete rules for using いっぱい たくさん and よく？

Of course I can use these but sometimes I am corrected by Japanese people when I use them in the wrong circumstance.

For example,

• 「よくしってるやん」 = "You know it quite well don't you!"


• 「よくいきます」＝ "I go (there) a lot"



• 「皿がたくさんあります」=　there are a lot of plates　　　　　　　


• 「人がいっぱいいる」= there are lots of people

Just wondering if anybody has any concrete rules that I can follow so that I don't make any (or as many) mistakes in the future.