I think this answer from the FAQ can help

What is a Curation Trail?
By using the 'Curation Trail' section, you can automatically upvote the posts (not comments) which are upvoted by the selected user. You can configure the 'upvote weight' for each user on the 'Curation Trail' page. You can also sumbit a short description and become a "trail" which other users will be able to follow. Note: For upvoting a user's authored posts, you should use Fanbase. Curation trails will not follow self upvotes.