I will leave the Haswell build thread as a sticky for those who may still need it as a reference.
There is a detailed z490 build thread I made a stick as it contains information that includes everything from how to do a clean build to .... Charlie Brown and what not to do with comic relief. Enjoy the thread!! It might help.
I recommend NVMe drives today and also decent size towers for air flow even with AIO or custom liquid loops. Clocking on air is becoming more and more difficult due to the number of cores/caches and hyperthread use at the same time. The liquid systems are coming into their time now.
Nothing has change with respect to memory speed and timing from the past. Higher speed memory with lower timing costs money, 2 sticks are easier to clock a system with than 4, top dog speed is not required but be wary of lower speed/high timing memory
Hardware changes fast over time. Within a year a motherboard can become obsolete and no longer sold.
A guide on clocking the i9 10900K series with all the parts involved is linked here. I can not say what parts can be used in substitution the same way as the ones listed in the guide become unavailable.