Go to this link
You will see a screen like below
Click on "Create new organization" and a new window will open like this
Next page will open like the one below,
fill in the name of your azure DevOps organization and enter that captcha
Now click continue
A new organization is ready now [In my case organization name: DynamicsCommunity101]
Now it will ask to create a new project, and a screen like the one below will open
Now click on Create project, it will take a few seconds to create the project
Once the project is created, you will see a screen like below