Three ways to build up your alignment

There are three ways to build up your alignment. Kill players of enemy faction, kill red players, or complete quests.
You gain your alignment by killing players of enemy faction, but you lose your alignment by killing good ones. No matter what the players of opposing faction are, you will not carry any alignment penalties if you kill them.
Kill red players. If a player’s name is in red, you gain alignment by killing him. This is based on the alignment system. A player in red is considered as evil, and others can kill him without losing an alignment.
The third way is to complete quests. You will get quests from NPCs by talking to him. You will be rewarded with items, starting weapons, and completing certain quests can help you build up your alignment.