Depends on if in this hypothetical fantasy situation if buy means initiate or complete the transaction.
1 million in index funds which I will reinvest later.
There is a turtle in my yard
It likes digging holes. It hides in it's shell when I get close, but otherwise isn't bothered by us.
Don't skimp on the power supply brand. Buy a reputable one. Buy one with headroom if you plan on upgrading your GPU at a later time.
Watch some build videos from tech YouTubers and watch the steps they go through.
For gaming start with the GPU and build around it. Pick a CPU with a reasonable price that will not bottleneck it. YouTube reviews are your friend here. Watch a few with your CPU and GPU pairing and get an idea of the average and one percent low marks.
For your first PC, stick to air cooling. Pick a reputable brand.
I personally like gamersnexus reviews for all the parts you can. They are very methodical with benchmarks. Ask questions here as you will have many.
You may be building a PC for a use case other than gaming. If that's the case you may want to pick another part to start your build around. For instance, developers have a different workload compiling code and would focus more on CPU and threaded workloads.
Basically know your use case, budget, and ask specific questions as you learn from videos and the community will help you produce a great result.
I'm here from reddit like everyone else. Software developer who likes building PCs, retro computers, sffpc, water-cooling.
I'm looking to see more communities similar to /r/sffpc, /r/retrobattlestations, and other PC hardware build subreddits that I used to visit on Reddit. I'm not sure how something like that would fit into the current community set. How do new communities get created here?