How do I change teams just by touching a part? [closed]

You can use a touched event to detect whenever an object touches the part, then determine whether or not the object is a player, and set their team.

Assuming that the team script is inside of the part:

local team = game.Teams.Team -- replace this with the directory to the team you want

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild('Humanoid') and game.Players:FindFirstChild(hit.Parent.Name) then
        local plr = game.Players[hit.Parent.Name]
        plr.Team = team
    end
end)

Script in part:

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then

    local teamColor = --[[ Put the colour of the team you want the player to be inserted to
                      e.g. Really black, Forest green, Institutional white, etc.
                      Make sure it is a string.]]

    local player = game.Players:GetPlayerFromCharacter(hit.Parent)

    player.TeamColor = BrickColor.new(teamColor)

    end
end)

Don't forget to accept the answer if I helped!