Thanks for the replies.

I'll post some hands once I have walked into some.

Let's say raising the flop and floating will both be profitable if villain doesn't have top pair (either on the flop or turn). I am wondering what the FE in both situations is.

Let's say;
UTG+1 raises $1, Hero calls with 77.

Flop (pot $2):
25A r
UTG+1 bets $1.50, Hero?

Let's say villain folds to a raise when he doesn't have an A.
1. Will he fold A8s+, AJ, AQ, AK?
AK and AQ probably not, maybe AJ-.

2. What would hero do on this flop when he has AJ (fold FP?) or AQ instead of 77?

3. When we float with 77 and a blank hits te turn, will the FE be any different?
He COULD be betting at us again with AJ+ and we have to fold. (especially when there was a flush draw at the flop a bet isn't that uncommon).
When he checks, is the FE any bigger than when we had raised at the flop?
I think AQ, maybe AK?

4. Let's say hero called in the BB. We're first to act at the flop. Is there any good in donk betting it with say $1.50? Or does that just say "Hey, I haven't got TP cause I would C/R you then?".
I do think vallain cannot call a donk bet with anything else but TP though, but the situation could be exploitable even for an average player.