I got one tip If you're into online first person shooters get a monitor that's at least 144hz so if you get a high end or mid-tier GPU your monitor can actually capture those extra frames per second. The extra frames can be the difference in you spotting your opponent on screen earlier as they appear. Also want highspeed internet to avoid lagging behind your in game team mates and enemies.
Also would recommend going cheap on the PC case and case fans. Use the bulk of the money to go towards a good GPU,CPU, and Motherboard.
And you're playing the games on steam if you scroll to the bottom of the steam page you can see a list of "System Requirements" there's split into two groups "minimum" and "recommended". Use the recommended specs to avoid low performance issues.
For Squad here are the recommended specs below. You will need Window 10 or later, a AMD or Intel CPU with atleast 6 cores, 16 GBs of Ram, your GPU will need to have at least 6GB of VRAM, internet, and 80 GB of free computer space.
You can "future proof" your gaming pc by going above the recommended specs in case the developers update the games you like to play to be more hardware intensive or you can save some cash and pay just for what you need.
Here's a list of parts I put together quickly using pcpartpicker.com and amazon.com there's another sites to buy your parts like newegg.com and microcenter.com
AMD Ryzen 7 7700X 8-Core - $270
be quiet! Pure Rock Pro 3 Silver CPU Air Cooler -$55
MSI B650 Gaming Plus WiFi Gaming Motherboard $-165
Crucial 16GB DDR5 RAM (2x8GB) - $44
Thermaltake View 200 TG ARGB Motherboard Sync ATX PC case -$65
SAMSUNG 990 EVO Plus SSD 1TB - $75
ASUS TUF Gaming 27” 1440P HDR Monitor (VG27AQ3A) – QHD 180Hz -$200
MSI MAG A750BN PSU - $95
XFX Speedster SWFT210 Radeon RX 7700XT $480
$1449 in total
This is a quick build I put together it doesn't include keyboard, mouse, thermal paste, Windows OS or tool cost. Just to give you an idea of what you could build for $1500 or less. Main concern with this build is storage being 1TB but you can add additional space later. If you want to save even more can get a CPU with 6 cores that's all you need for Squad and a 1080p monitor instead of 1440p. Buy the parts used rather than new.