Unitys 2D tools and workflow are powerful and quite useful. But there are some minor details and useful tools missing.
The “2D-Extras” <-Click to go to the github page. They will tell you all you need about installing it.
They are not necessary for you to make a game but they are helpful in streamlining the tile-map creation process. The dude with a nice voice down below can show you and explain it better than what could bother with.