[binions]

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Especially the hand grouping stuff is driving me crazy. I have the Sklansky groupings, then I found some study on the internet that attempts to prove that they were incorrect and then I got the Lederer groupings. Quite a dilemma...

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No dilemma. In all but the toughest games, suited cards that add to 20, AA-77 and AK-AJo + KQo are your bread and butter in unraised pots.

Other hands are situational. Those situations can include:

Improved position

As your position improves in unraised pots, suited aces and suited cards that add to 19 can be added even if the pot will not necessarily be multiway.

A multiway pot

If there are 2 or more limpers (plus the blinds), you can add all pairs. With 3 or more limpers, all but the smallest suited 0- and 1-gappers become playable. In late position, suited King-middle becomes playable multiway.

If you expect 5 people to see the flop because that's the way your table plays, then you can call with any pair in early position even before there are limpers.

A weak player has entered the pot

Usually, you want to raise and isolate. You don't always need to have even a normal calling hand, as you will be playing the board against this player if you are successful in isolating him.

Blind steal

If you are in late position, and the pot is unopened, unsuited big cards that add to 20 become playable. Since the pot will not usually be multiway but heads up, being suited is not crucial because you will not have the pot odds to draw anyway. Instead, you will be hoping to flop top pair and punish draws, dominated hands and middle/third button hands.