Now that you have finished assembling and making a functional and running computer it is now time to install your Operating System and drivers for your computer.
For getting a operating system you first have to know what operating system you want. The most popular operating system is Windows which cost money to install and get a license for your computer. There are other free operating systems though like Linux which is popular as well.
First you must download the operating system on the thumb drive. After installing it on a thumb drive you can then install it on your new computer from your thumb drive. After installing your operating system and setting it up then you can install all the drivers you need on your computer.
Some hardware components like your motherboard, GPU, and some CPU’s have drivers that help your computer components perform there best.
Just incase for help this video will help you understand what to do after building you computer.