A conceptually simple but strategically complex game. Most players have been friendly on the server I play on. Don't get discouraged by rage from teammates, most likely they are trying to obtain a flair (little picture above your ball) that is awarded upon achieving a certain win rate.
A good tip to prevent the other team from scoring a capture is to stay between the opposing flag carrier and their goal! A popular strategy is "camping" at the other base to pick up their flag when your own flag carrier dies, but this mostly applies to maps where there are 2 flags rather than 1. I think players in this game call it "regrab" or just "re" for short.
If you have the time, you should definitely watch the tutorial videos on the homepage - and if I recall correctly this game has a pretty active reddit community so check that out if you want to participate in TagPro discussion!
Overall, I give TagPro by Koalabeast Games a 5 out of 5 stars. Keep up the great work Koalabeast!