PvP in Destiny 2 comes in three main forms: Quickplay, Competitive, and Trials of the Nine. If you're a complete beginner, Quickplay is where you want to start. And don't worry--level advantages are disabled in the Crucible, so your Power level doesn't matter. There are three modes in Quickplay: Clash, Supremacy, and Control. Clash is a team deathmatch mode, Supremacy tasks you with picking up and "claiming" kills in the form of gems that drop from defeated opponents, and Control involves capturing and holding three zones. Competitive includes a survival mode where your team has a limited stock of lives and a plant-the-bomb mode.