How do I gain XP?
You will earn XP at the end of a match on official servers. In a Competitive match, your earned XP is determined by your rounds won. In all other game modes, your earned XP is determined by your score. Additionally, at the start of each week you will receive an XP bonus boost. During Operation Bloodhound, you can gain extra XP by completing missions.
What happens when I earn enough XP to gain a Rank?
Whenever you gain a Rank, your CS:GO profile Rank will increase and you will receive a new profile icon. Additionally, your first Rank earned each week will reward you with a weapon drop. If you have an Operation Bloodhound Access pass, your earned weapon drops will come from one of the exclusive Operation Bloodhound weapon collections: Cobblestone, Cache, Overpass, Gods and Monsters, The Rising Sun, and Chop Shop.
Is there a limit to the number of times I can increase my Profile Rank?
There is no limit. Regardless of how much you play, you can always continue to gain XP toward a new Rank.