The game is solo or co-op with password only, limit of 10 players and not hosted by Valheim nor are there any official servers that I know of. There are some rando servers open to folks but you can also ck the official discord Valheim threads. I would be very careful. There is not really any way to protect yourself from creeps and rl trolls which is why locking is good. Learning the game solo is also not a bad idea.