Expertise is your personal focus and understanding that makes you a candidate to write, review or edit in that area. You may have multiple areas of expertise which you can define in your profile. You can manually add areas of expertise from the bio section of your Loop profile.
In addition to manually editing your expertise, Loop will suggest various areas based on your confirmed publications.
If areas of expertise appear in your profile that you feel are not relevant, you can remove individual bricks by clicking X in the top-right corner of the brick
Expertise bricks can also be removed all in one go, by first clicking the pencil icon, and then selecting 'Clear All Tags' , as shown below