What country are you located, what is your budget, what if any components do you plan on reusing and if your build is for gaming what is your monitor resolution?
Resolution full HD 1080p 1920 x 1080 response time 5 ms
The budget is 750 to 800, I am open to suggestions, I have been told to stay away from intel i3 10105f, amd ryzen is my preference but not a mustWithout a budget, and make/model, for your power supply, it is impossible to suggest anything.
Get yourself a cheap USB flash drive, download Windows Installer and use the free version of Windows for now.
https://www.bhphotovideo.com/c/product/1543118-REG/cougar_mx330_g_air_gaming_mid_tower.html
COUGAR MX330-G Air Mid-Tower Case $62.99
https://www.newegg.com/evga-550-b5-220-b5-0550-v1-550w/p/N82E16817438167
EVGA 550 B5 80+ BRONZE 550W Modular Power Supply $53.18
https://www.newegg.com/asrock-b550-phantom-gaming-4/p/N82E16813157935
ASRock B550 Phantom Gaming 4 $84.99
https://www.amazon.com/dp/B09VCHR1VH
AMD Ryzen 5 5600 $144.95
https://www.amazon.com/dp/B098D84SLF
Thermalright Assassin X 120 SE CPU Cooler $19.90
https://www.newegg.com/team-16gb-288-pin-ddr4-sdram/p/N82E16820331542
Team T-FORCE VULCAN Z DDR4 3600 16GB (2x8GB) CL18 $49.99
https://www.newegg.com/team-group-1tb-cx2/p/N82E16820331561
Team Group CX2 2.5" 1TB SATA III 3D NAND Internal SSD $56.99
https://www.newegg.com/gigabyte-radeon-rx-6600-gv-r66eagle-8gd/p/N82E16814932481
GIGABYTE Radeon RX 6600 EAGLE 8GB Graphics Card $219.99
Total: $692.98
Optional card.
https://www.newegg.com/msi-radeon-rx-6600-xt-rx6600xt-mech2x-8goc/p/N82E16814137682
MSI RX 6600 XT MECH 2X 8GB OC $279.99