In search results
When a skill is shown in search results, the icon(s) in the top left corner represent the skill's location options:
The road icon
This icon means that you can choose the location. In other words, the instructor is willing to travel to a location chosen by you.
The location icon
This icon means that the instructor has a location where you can meet.
The online icon
This icon means that the instructor can teach you via an online video call.
Note that it is also possible for a skill to support multiple options.
On the skill's page
When on a skill's page, you can see what location options are offered under the location of the skill.
You can also see this at the top of the booking sidebar on the right of the page. On mobile devices you would need to press the book button at the bottom of the page first.
If you want to learn more about location options, then please read this article.