I'm new to valorant and I want to learn different roles who do you guys think is the easiest and/or best in each role?

IDK if it's insane bad luck, but ever since the new act, I've been losing a ton of games. I've won 3 in about 15 games. It's not even the usual AFK or bad teammates. I've been doing my part and getting MVP or playing my sentinel/controller...

Isnt Harbor really bad for defending side? You can't really resmoke chokepoints and it really isnt viable without a 2nd controller. People could fake sites to bait his smoke and then run to another site and harbor needs to wait atleast 40...