How to add a relative link in GitHub README.md file?

You can refer a markdown file to another markdown file on GitHub using a relative link.

Suppose your GitHub repository stricture is like below:

project/
    text.md
    subpro/
       subtext.md
       subsubpro/
           subsubtext.md
       subsubpro2/
           subsubtext2.md

project/

text.md

subpro/

subtext.md

subsubpro/

subsubtext.md

subsubpro2/

subsubtext2.md

The relative link to subtext.md in text.md might look like this:

[this subtext](subpro/subtext.md)

1 2	[this subtext](subpro/subtext.md)

The relative link to subsubtext.md in text.md might look like this:

[this subsubtext](subpro/subsubpro/subsubtext.md)

1 2	[this subsubtext](subpro/subsubpro/subsubtext.md)

The relative link to subtext.md in subsubtext.md might look like this:

[this subtext](../subtext.md)

1 2	[this subtext](../subtext.md)

The relative link to subsubtext2.md in subsubtext.md might look like this:

[this subsubtext2](../subsubpro2/subsubtext2.md)

1 2	[this subsubtext2](../subsubpro2/subsubtext2.md)

The relative link to text.md in subsubtext.md might look like this:

[this text](../../text.md)

1	[this text](../../text.md)

If you want to refer to an external file (not present in your repository), you can use an absolute like (anchor tag) like this:

[this external](https://github.com/user/repo/blob/branch/external.md)

1	[this external](https://github.com/user/repo/blob/branch/external.md)