Add a tag to a door when you are adding a door. When you are adding a visit, scroll down to the bottom and you should see tags. You can add as many tags as you would like. Don't know how to add a door? Click here
Go to the Home either on the Web App, iOS or Android & click Tags under Filters.
Click each tag or the tags you have to filter by and the places show up in the places card on the right. You can also Pick between Places or Visits on the top tabs.
Press the Filter Tags button on the bottom. When the page comes up, press each tag you have to filter by. You can also pick between Places or Visits on the top tabs when you leave the Select Tags page by clicking Back button.