There are many resources to help you build a pc, here are some of them:
https://uk.crucial.com/articles/pc-builders/how-to-build-a-computer - blog on how to build a pc and recommendation
https://www.digitaltrends.com/computing/how-to-build-a-pc/ - similar to above
https://www.reddit.com/r/buildapc/ - forum with a lot of posts with questions and answers about building your own pc
https://www.chillblast.com/ - website which has custom build pcs to help you see some of the components and options
https://www.pcspecialist.co.uk/custom-pc/ - website which guides you through your budget and helps you pick parts

I would also recommend checking out youtube for tutorials.
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