Render pipeline

Should i use a render pipeline for my game? and if I should what are the cons and pros? and can I get a render pipeline on my project now or should I start over?

All projects use a render pipeline. The question is which one you should choose. By default, you are using the built-in rendering pipeline. But you can also use the scriptable rendering pipeline. If you choose the scriptable rendering pipeline there are two templates to choose from, LWRP (URP) and HDRP. Here‘s a video by Brackeys explaining the difference.

You don‘t have to start over to change the render pipeline. Google how to change the render pipeline to the one you want. It‘s very easy.