Github lets you customize your profile page. here is how to do that.

How to customize your github homepage?

when you create a repository with the same name as your Github username and add a Readme.md to it. Github display it content directly on your profile page.

so lets do it in steps:

1. Create a new repository as your Github username.

2. Check the Add Readme.md option while creating the repo.(Or add it manually later).

3. Edit the Readme to include you bio, skills, tools, social links, top projects, github stats and more.

If you are not familiar with markdown check out
Github's basic markdown guid

Tool Section.

You can use
Profile Readme Generator.
It's a free online tool which helps you create a professional Github profile without writing raw markdown.