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If Im understanding correctly we play specific types of tight hands when we are in early position because we don't know what the plyers behind us will do. Conversely we play other types of looser hands when we are in late position because we have more info on what happened in front of us. Am i correct in this or am i missing another element?
That is the gist of it. When we are in early position, there is a much greater chance of one of the remaining players waking up with a big hand, simply because there are still more players to act. Furthermore, we are likely to play the hand out of position, so we want to have a stronger hand on average to account for our positional disadvantage. When it is folded to us in late position, we have fewer players left to act, and hence fewer players who can wake up with a big hand. We also have a higher chance of playing in position against one of the players in the blind, in which case we will have a positional advantage. This is why you can open so liberally on the button. There are only two players, who will have weak hands a lot of the time, and if they do choose to play, you get to play in position against then.
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Also, what do you do if the whole table is not playing in position? like some donkey in early position or a whole table of them?
Your preflop action will differ if you are RFIng vs if you are acting after a field of limpers. In particular you are going to be more likely to choose a passive action with some of your weaker but still playable hands, like AJo, suited aces, weaker suited broadways, small pocket pairs, suited connectors. IMO, you need a substantially stronger hand to raise against a field of limpers than you do to RFI in the same position. After all, someone could be trapping. And here the quality of the limps will come into play. OTOH, against a single limper, or even multiple extremely loose limpers, we might be tempted to punish with our entire RFI range. It also matters, do these players have a raising range? Because if they are raising strong hands, but limping weak ones, then this is an even better situation to be against.