I really have no questions about opening from all positions except sb/button, from them I open 2bb almost always, so as not to blow the pot too much, because many in such tournaments will call hands that look good, with strong hands, rarely but open 2.5 -3bb no one notices this, but it's beneficial for me. but about sb/btn. under normal conditions, it is necessary to open 3.5-4 from sat, 2.5-3.5 from btn. but considering what range we open with, wouldn't it be loose to open on the solver, because again in the freeroll everyone calls and can get there. it seems to me that it is worth either narrowing the range very much, or opening as usual and getting from weak players postflop
Opening differs by position:
Full ring UTG to MP about 3 bb first in, if you have limpers before you add 1 bb, so if you have one limper before you raise to 4 bb
After MP, so for HJ, CO, Button, the RFI is 2.5 bb + 1 bb per limper.
2bb rfi is only a minraise, it shows not really strenght.
You will get a lot of callers behind, because it is still cheap to enter the pot, it makes hands harder to play because you are out of position most of the time.
Goal, mostly play hands in position.
If you want callers in SB and BB to your button minraise, this is ok,
But if you want to take down the pot directly, you have to make it more expensive for SB and BB players.
Raising a hand shall give you the opportunity to play this hand heads up and not multiway, hard to achieve in today's games.