One great way to customize your site (besides colors and images) and add more functionality to your site is to add widgets.

I added the Tag Cloud widget to my sidebar!

Now anyone can find all my posts with specific tags. For example, if you click on “mountains” you’ll see all my mountain shots. As well, “GIS” points to all my GIS work.

Here is a screenshot for adding a widget:

And here are the instructions I used:

https://codex.wordpress.org/WordPress_Widgets