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Gaming Setup and Peripherals
Peripherals are where people either overspend on stuff they can't feel, or underspend on the two things they touch for six hours a day. Monitors and mice are worth money. A lot of the rest is preference and vibes, which is fine, just know which one you're buying.
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Monitors
The short version: pick your resolution based on your GPU, then worry about panel type. 1080p if you want max frames or you're on older hardware, 1440p if you want the best balance of looks and performance, 4K if you have the horsepower and you sit close enough to see it. OLED is the play for gaming and movies if the budget allows, IPS is the safe pick, and VA is a contrast play that comes with tradeoffs. Full picks are in the monitor lists, broken out by 1080p, 1440p OLED and 4K.
Keyboards
Switch type is the first fork and it's simpler than it looks. Linears are smooth all the way down and are what most gamers land on. Tactiles have a bump partway through the press, which a lot of people prefer for typing. Clickies are loud and you should think hard before bringing one into a house with other humans. Nobody can tell you which you'll like, so if you can, buy a board with hot swap sockets. That means the switches pull out with a tool and you can try something else for fifteen bucks instead of buying a whole new keyboard.
Size is the second choice. Full size gives you a numpad, tenkeyless drops it and gives your mouse a bunch of desk back, and 65% or 60% drops the function row too. If you play claw or low sensitivity, going tenkeyless or smaller is a real quality of life upgrade for your arm. Beyond that you're paying for build, so a gasket mounted board with decent foam sounds and feels much nicer than a hollow plastic one, even though it does nothing for performance. Wireless is a solved problem now, a good 2.4GHz board has no latency you'll notice.
Mice
Shape and weight matter far more than the sensor. Every sensor in a modern gaming mouse is excellent and you will not out-aim any of them. What you'll feel is whether the shell fits your grip and how much mass you're dragging around. Under 70 grams is noticeably nicer for fast flicks, especially for claw and fingertip grips, while palm grip players usually want something with more body to it. Try to match the size to your hand rather than buying whatever a pro uses, because their hands aren't your hands.
For wireless, use the 2.4GHz dongle, not Bluetooth. Bluetooth is fine for a laptop and bad for gaming. On polling rate, 1000 Hz has been the standard forever and 8000 Hz is the current spec war. It's a real difference on paper, but it eats CPU cycles and most people can't pick it out blind. I wouldn't pay extra for it. Also grab a decent cloth pad while you're at it, since a large control pad is a cheap upgrade that changes how the mouse feels more than another sensor upgrade will.
Headsets and Audio
A gaming headset is the convenient answer. One device, mic attached, wireless dongle, done. What you give up is sound quality per dollar, because you're paying for the mic and the wireless inside the same budget. If you care about how games and music actually sound, a pair of regular headphones plus a standalone mic on an arm will beat a headset at the same price, usually by a lot. The catch is desk space and a bit more setup.
Don't get talked into an expensive DAC or amp for most gaming headphones, since anything with normal sensitivity runs fine off a motherboard jack. Virtual surround is also mostly a gimmick, decent stereo imaging on good headphones gives you better positional audio than most of the surround processing does. If you're on wireless, check battery life and whether it charges over USB-C, because that's the thing that'll annoy you daily.
Controllers
If you're buying a controller in the current era, look for hall effect or TMR sticks. Standard potentiometer sticks physically wear down and that's what stick drift is, so a controller that uses magnetic sensors mostly designs the problem out. It costs a little more up front and saves you buying a replacement in eighteen months. Beyond that, the useful features are back paddles, trigger stops for shooters, and swappable stick heights.
Wired vs wireless is a preference thing for most games, since the latency difference on a good wireless controller is small enough that only fighting game players tend to care. Layout is the bigger question. Offset sticks vs symmetrical sticks is the thing people are quietly loyal to, so if you grew up on one, just buy that one and don't overthink it.
Desk, Chair and the Boring Stuff
Your desk surface and chair get ignored and they shouldn't. A wide desk that lets your whole forearm rest on it takes strain off your shoulder, which matters more over a long session than any peripheral you own. Deep is better than long if you have to choose, since it lets you push the monitor back to a comfortable distance instead of sitting on top of it. For the chair, a used quality office chair beats a new gaming chair at the same price almost every time. Those racing seats look great and support your body in fewer places than a boring mesh chair does.