To add links to your Tumblr bio, you'll need to use a simple HTML code. Tumblr doesn't give you any sort of built-in way to add links yourself, so you'll have to copy and paste the code in manually.

You can edit a Google Site to customize its appearance. Google Sites allows you to add text, images, hyperlinks, YouTube videos, and more to your webpage. You can also add charts, sheets, documents, ...