Okay quick primer on 2e, especially for those of you new to it.
1) Attack of Opportunities are no longer a guarantee. They're a feature typically given to very "martial" oriented classes/monsters like warriors/fighters/barbarians. AoOs are something to keep in mind but in general unless your opponent is highly trained or has quick reflexes you're probably safe to move out of combat with them.
2) Your turn is made up of 3 actions. Typically everything you want to do is going to be 1 action so you get three picks. Attacking is one action, moving your full move speed is one action, taking a "Step" which is the 2e version of a 5' step (thus avoiding AoOs) is an action. Interacting with the environment or your stored equipment like drawing a potion or a sword etc., one action. It makes things super easy because when in doubt, it's probably a single action.
3) If you attack multiple times, you suffer penalties. It doesn't matter if you attack with different weapons although different weapons have different properties but in general it is -0/-5/-10 to your attack rolls. I've listed out the successive attacks in the combat tracker.
This can be altered by your weapon. For example Zug Zug uses a
greatclub that has Backswing that gives a bonus if you miss on your previous attack. Other weapons are Agile that makes it -0/-4/-8. Check your weapons for their properties on the Archives just in case I forget.
4) Some classes/abilities gives you new "actions" to take in combat. I should call these out in your combat tracker.
Otherwise things are pretty similar to 1e. The multiple actions and steep attack penalties means that especially at low levels it makes sense to do things other than stand and swing.
Here is a list of common actions you can take in combat