How does one deal with online trolling/harassment in video games?

Examples of issues I have faced as a player:

• Running a game with friends and having one random player join in and ruin it, constantly
• Playing a game and getting ganged on by a group of players
• Playing a game in which I set some conditions for a room and players try their very best to get me frustrated
• Players hack my online account and to ban me from games
• Players asking me to relinquish items to them or be mass reported on a game

I would like to know to deal with online trolling or harassment in video games. What can I do, as a player, to fight this off? I am not looking for specific solutions that pertain to individual bullet points above, I am asking how to deal with online bullying and harassment as a whole. What can I do to prevent me from getting targeted by trolls?