Hello brother.
For me first as online you have to focus on the table.
It doesn't matter if there are 100, 1000 or 10000 participants. You have to try to be the king of the table.
Do not get distracted, see movements according to the position of your opponents.
Try to discover the recreational players. This is not very difficult, the recreational player in general likes every card he has in his hand and believes it is a winner. So he limps almost every hand hoping God Luck will enlighten them, which it can, but not every hand.
When you bet, do it safely, do not hesitate.
Be aware of when the blinds go up, when you get the SB or BB.
DO NOT clean Your hand must be safe preflop minimum 2.2 to 2.5 BB in open raise.
Live semi pro or pro players know that if a blind is at 3000, the open raise for it is 6600 (2.2 BB) 7500 (2.5 BB) and 9000 (3 BB). This must be very clear. If any player finds out that you are recreational, they usually do it because of the way they bet.
Even if you don't play a hand, watch the hand you don't play. Look at the tips of your opponents. There is always some tip that gives you information for your future game.
Be patient. You will not have too many hands to play, but the ones you play must be maximized.
Except to defend some BB, don't play stupid variants. Your cards must be related to form two pairs, straights, flushes or more. With stupid combinations you can luckily achieve something, but you won't always, sooner or later you will lose.
Be friendly at the table, both with the croupier/dealer and with the rest of the players at the table.
Don't waste a lot of time talking, unless you talk less about poker with someone. Your objective is not to give information, but to gather information from others for your objective.
Well, not much more brother.
Another thing, go rested to play. If possible, do not drink alcohol, it is not your house but a place where you will spend many hours playing.
You must take care.
Greetings brother and success