"How Should Rake Influence Your Decisions?
Simply put, higher rake lowers your EV (Expected Value).

How does this affect your decisions? In a nutshell, higher rake forces you to play a tighter style of poker.

This means that all those marginal postflop calls become folds. Moreover, this has an effect on the preflop ranges since those marginal open-raises, calls, and 3-bets depended on those marginal value bets, bluffs and calls to be profitable.

Consequently, you have to play tighter preflop and postflop."

Where I play, 10nl is 7.5% rake with a max of 1 euro. 20nl is a 5% rake.

I really dont understand this rake stuff, to give some from session I ran:

Last session I lost 1.70 euro and paid 1.87 in rake.
The session before that I won 15.53 euro and paid 4.48 in rake.

Since I started playing poker again I played 16k hands, I lost 20,27 euro but I seemed to have paid 148,76 in rake. Seems like I could have might as well deposited a bit more and play at 20nl where the rake is 5% compared to 7.5% and a max of 2 euro rake per pot.

Some crazy ones are the ones where I won for example:
4,75 but paid in rake 8,96
2 euro but paid 7 euro

How is that possible? To have paid more rakeback (double and triple) then I won?