1. 1h-p-1nt-2d-3c
I prefer new suits freely bid at the 3 level to be game forcing (partner only bails if they smell a misfit). With extras but not game forcing values then opener can dbl. 2nt would be a good 17-19 playing 2/1.
2. In sayc the auction 1h-p-2d-p-2nt is not forciing - 2nt shows a minimum opener.
In 2/1 it's forcing to game. Thus you can use the folllowing ranges in 2/1 for nt bids of 2nt 12-14 and 18+ and 3nt of 15-17. With the 18+ hand opener bids again.