Lemmy communities you should keep an eye out for is: !gamedeals@lemmy.world for freebees and discounts. The other social media site that shall not be named also has a similar community with the same name.
As for new games when in doubt, Humble Bundle. They currently have some fantastic game deals right now if you are a fan of Capcom or Indi games. Outside of the Destiny 2 bundle I've heard nothing but positives from them.
Now as you say you are new to PC gaming I'm going to recommend you some niche/personal fav games of mine that either aren't on consoles, or aren't know well on consoles.
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Antichamber, a first person "shooter", that's more of a mind bending puzzle game. The most atmospheric game I've played and a wonderful time.
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Most thing from Valve, Half Life 1 & 2, Left for Dead, etc. All good fund and often onsale for dirt cheap. Get it if you find it for the right price. The YouTube series "Freeman's Mind" is worth a watch if you want a see what the gameplay is like.
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Portal 1 & 2, Valve FPS and puzzle games. Well known, and obviously recommended. Play in order is advised.
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Slime Rancher if you are looking for a framing game in the first person
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Star Wars Dark Forces, Star Wars in the Doom Engine. Not the biggest fan but it's the first in a series of fun adventure games.
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Star Wars Jedi Knight Dark Forces II, This is an interesting genera of game. It is a FPS, but it's in the mission structure of the old doom games. With a narrative of Star Wars. There are light sabers, and you can cut off your enemies limbs. Fun time
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Star Wars Jedi Knight II/Jedi Academe, aka Dark Forces III. Same as the first game but you get your saber quicker. Had a blast with academe.
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Super Hot: Super. Hot. Super. Hot. Super. Hot.
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Team Fortress 2. Team based hero FPS before Overwatch. I've heard the quality went down recently but I haven't checked.
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Wolfenstein The New Order. Just a very angry dude killing nazi's what's there not to love.