Creating a New Post
This is the layout of the Classic Editor. I am used to it and do not need all the fancy features Guttenburg.
Start with the title of your post. Once that is entered, you will see the Permalink underneath.
Then start typing your post. If you going to use Headings, it is easiest to type in the text first and then highlight your heading and them choose which heading you want to use.
Quite a lot to chose from. How they look will depend on your theme.
I explain the Toolbar here.