As you can see below when you click on the add block button it will give you a search bar and it will show you the most used blocks. These are blocks that you use the most often.
If you were to scroll down, you will see additional block categories you can choose from. As seen below.
Common blocks are WordPress blocks that people use a lot. Like paragraphs, images, and lists.
Formatting has blocks like code, tables, and custom URL
Layout elements have blocks like buttons, page breaks, and columns.
If you click on the last icon in the bar it will give you different options that you can do with the block. As you can see below.