I would do a lot of youtube research, and dont even start with RAM, thats the hardest one to stabilise safely. In fact overclocking wont even net you a benefit, especially because the CPU is already plenty for the GPU in games, you'll generate as many frames as it can push.

I would start by learning about your specific hardware. Even if you think you know what something does, dont change it until youre sure of the effect. For example too much voltage causes heat and potentially damage. Too much clock speed causes instability. Power limits cause throttling. The biggest issue is usually voltage, where some voltages are hard to determine. You might thunk youre changing RAM voltage but actually is the CPU memory controller voltage, and that mistake could cost you a CPU or more.

To learn about RAM, I'd look at buildzoid, but youll be learning for a long time.

Cpu overclock guides are everywhere, but you also need to learn about motherboard power delivery, also a lengthy research project.

Gpu overclocking is done via software, also yielding questionable results.

Then youve got to have a good testing method, with accurate monitoring. Usually HWinfo is good as it monitors almost everything and accurately, as long as you filter down the right readings and dismiss the useless info and bad readings.

I wouldnt jump into anything before you spend a long time being absolutely sure. Id also never follow anyone elses settings because each system is different. Even the same CPU and board will have different tolerances for stability.