Sticking to the plan - always good. White can also now play Nf3-e5! when Nxe5 is met with fxe5. The Nc3 will then travel to e2 then to f4 attacking g6 and e6 simultainiously - tying down blacks pieces.

A knight e5 would be splendid.

20...Nd8 with the point that 21.Rf3 Nf7 prevents the doubling of whites rooks on the g file

Black is trying to create some counterplay but it is too slow. White should be winning.

Nf3-e5 is much better but it is good that you realise your mistake. Next time you see that awfully weak square you will know to shove a knight there when there is nothing your opponent can do.

Positionally this looks dubious. Black is now given chances to get his Bishop to c6 where it actually does something. He is - however, still left with many weaknesses but I would prefer to limit the counterplay. The immediate Bxh5! looks better as Nxd2 Qxd2 keeps the a8-h1 diagonal closed.

A nice tactical shot.

The only real place where the bishop has influence.

Nd5 is by far better. a6 is unnecessary.

? Uh oh. When moving your bishop into a position such as this always think of how you get it out! After Rb8 black can trap it eventually.

28... Rb6 traps the bishop

I do not really think there is a difference but this move feels more natural to get the bishop somewhere.