1. Most of poker rooms enable you to make notes of other players, that way its easy to access them. I note everything I find useful, from players ranges, to bet sizing/timing tells, ways they play certain hands, etc.2. 3-bet = when you are third player who raises the pot.Shove = going all-inSo 3bet shove would be when you are third player to raise the pot and you go all-in.Example: Preflop. Big blind is posted (therefore that player is first betting in a pot). Mid position player raises for 3 big blinds. Late position player goes all in. Therefore, late position player did a 3bet shove.Or you can have flop (or turn/river) situation. Player 1 bets. Player 2 raises. Player 1 goes all-in. So players 1's third action was 3bet shove.3. This is probably reffering to a donk bet. Its an action where you bet the flop without initiative. Usually, the last player who makes preflop raise is considered to have an initiative in hand, so if on flop, anyone who acts before him places a bet, that would be called a donkbet or stab.4. Betting two streets in a row. EDIT: There are some poker term dictionaries online. If you don't understand a term you can google for something like: poker term XXXXXXXX   or   poker dictionary XXXXXXXXX

Doesn't have to be donkish, though it probably got named that way because of its constant use by newbish players who don't understand some concepts of a game. But there are more reasons to donk bet. Most common reason is to induce bluff from aggressive players who often get annoyed by donkbet and can't resist but to raise over the top with weaker hand. Also, preventing villain from getting a free card on a flop is a good reason (if you can put him on a draw, or he checks back flop often). So, many reasons, but if you got the right one, donkbet isn't donkish at all. :)EDIT: When weaker player donk bets (im talking about fullring games here), he usually represents top pair weak kicker, or some mid pair he/she flopped.