The Lookout is a Town Investigative role with the ability to observe a player and see who "visited" them during a particular night. The Lookout can be considered the opposite of the Detective, which in contrast, observes a player and is able to see who that player "visited" during a particular night.
Even if you know the Sheriff will be healed and thus will not be a target to be killed, you can still garner valuable information, such as the identity of a Consort or Blackmailer that may be targeting them.
On Day 1, it can be difficult to decide who to target. Try to target names you think will attract attention, or people who were drawing attention to themselves on Day 1.
The Lookout can act as a roundabout Investigator/Sheriff. If only one person visited your target, and you know what happened to that target (such as being shot by a Vigilante or role blocked by an Escort), then you can safely assume that they are part of the Town.
Conversely, is someone died that night and there was only one person who visited him, you can safely conclude that they are evil and should be lynched. The one exception to this is if the Godfather is immune to detection, and Lookout does not bypass detection immunity, and that person was killed by the Mafia (See Death Descriptions). In which case, unless the person who died that night was cleaned (In which case the person you saw was a Janitor), you would be unable to draw conclusions.
Be wary of concluding that someone is Mafia if the "Ignore Detection Immunity" option is Off. Check to see if it's possible that a Mafioso is in the game. If you saw only one person visit another person that was killed by the Mafia, and the Godfather is in play, and he is immune to detection, then the person you saw is not the Godfather. It is unlikely that he is another Mafia role (unless the dead person was also cleaned by the Janitor), but Witches and Bus Drivers could have redirected them to the dead person. It is likely they are not Mafia, but it is not absolute, though they are not the Godfather.
Do not automatically back a Sheriff's or Investigator's results if you saw them visit a person they say is Mafia, but that person claims to have been framed. You can only rule out a Framer's presence if the "Ignore Detection Immunity" setting is On. Otherwise, it is still possible for them to have been framed despite the fact you only saw the Sheriff or Investigator visit them.
Utilization of the last will command is pivotal to the Town roles's success as a Lookout. Always leave unrevealed clues in the last will to help the Town even after the Lookout's demise. Use the last will by typing -last will or -lw into the chat and fill information into the prompt-box.
Having an easily readable and understandable format can be very important. For example: