How to overclock?

 Overclocking is a bit of a guess-and-check sort of process, it involves increasing certain values and then checking if the values are running stably. This can be done through your computer's BIOS which can be accessed in many ways normally holding the delete key during booting. Every computer's BIOS is different and the best way to overclock for your specific processor is to look up a guide on youtube because every processor is different physically and some overclock better but a general guide to overclocking your processor is a good idea. Overclocking your CPU is done through increasing voltage, and clock speed multiplier. As for overclocking your GPU, it is a little bit less complicated. Overclocking a GPU isn't done through the BIOS, it is done through software. Overclocking your GPU is done through increasing voltage, clock speed, and onboard memory speeds. The most common software is MSI Afterburner but there is other software that is normally brand specific to your GPU'S sub-vendor (I.E EVGA, GIGABYTE, ASUS, etc.) MSI Afterburner can be used for any overclockable GPU. There are guides on how to use the software itself but it is very simple compared to CPU overclocking. Next is RAM overclocking which is very similar to CPU overclocking, RAM overclocking is done through the BIOS and involved increasing the RAM's clock speed as well as timings. RAM is overclocked best when you are using the same RAM modules as mixed modules have compatibility issues that don't affect anything until you try to run them beyond base speeds. As for overclocking, it will take between 10-20 minutes, most of the time is used for the next part of overclocking.
Benchmarking.
Benchmarking is a type of stress-test, that is used to check for stability. Stress testing a CPU is done through mostly running a CPU based rendering that if your overclock is unstable can shut your pc off or crash, bluescreen, or a number of other weird errors. Unstable GPU overclocks cause artifacts that are weird unintended visual glitches (stretched textures, light flares, pixelation, etc.) There can also be crashes that normally won't shut off the computer but in some cases can. Ram instabilities are normally manifested in bluescreens. Failure to boot, boot looping, crashing. Benchmarking is a great thing because it lets you figure out if things are working, and how well they are working.