I have been trying to fully understand these reading through the book but I am still a little confused about somethings. Especially the topologies for mostfet common gate common source common drain, what do they mean by common? Each one looks completely different and I can't seem to figure out what the differences exactly are. Common source and common gate both end up being grounded but common drain still has common source as a ground which is what confuses me. Also if anyone has good tutorials or example problems that I can go through please leave a link! Thanks.