This is paragraph 1. 

This is paragraph 2. Created with 1 break (enter). In the editor, there's no distance between the two:

This is paragraph 3. 

This is paragraph 4. There are two breaks (enters) between it and paragraph 3. 

This is paragraph created with a <br> tag.

This is paragraph 5. It has a link.

This is paragraph 6. It has lists:

1. One

2. Two 

3. Three

• One

• Two

• Three

Heading 1

Heading 2

Heading 3

Heading 4