Beginner Question: How to separate assets from a large selection of assets

To keep it simple:
I want to know how to turn this sprite sheet into individual sprites that I can work and manipulate more easily. I just started using Unity today and if this is a duplicate then apologies in advance because I’m not sure what these sprite sheets are called.106822-roguelikecity-magenta.png

First you will import your img Unity.
After selection your img inside unity and you will see right side Inspector menu
You must make Sptrite mode => Multiple after click Sprite Editör button.
106826-sprite-editor.png
After you see sprite editor left top menu Slice selection, you will click slice button after open menu. This menu type auto, grid by cell size or grid by cell count. you can choose what you want. and you can make your image.