How do you increase levels in the game? I used to play Oblivion but I'm not sure how best to increase the levels in this game. Appreciate your advice & thanks.

Just start doing some quests, or even just exploring. You will get XP for every location discovered, quest completed, enemy killed, lock picked and terminal hacked. Levelling up will come very quickly so don't consciously think about it. You will reach the level cap way before you have seen everything in the game.

Just get out in the Wasteland and enjoy the game. And welcome to the forum.

Thanks for the tip.

Just adding, sucesssful speech checks and disarming traps also give you xp.