My script won't work, can someone help me?

game.Players.PlayerAdded:connect(function(player) --fetching a player
    --player.CharacterAdded:connect(function(c)
    --remove the "--" from above if you want the player to receive the katana every time he/she respawns
    repeat wait() until player.Character --waiting for character
    wait(2) --just in case
        if player.Name == "red106" then
            game.Lighting["Katana"]:clone().Parent = player.Backpack
    end
end)
--end) --if you deleted the "--" from line 2, then remove the "--" here

Above should work.

This should work just fine. The only reason it wouldn't work is if you are doing this on Solo Test. Either way, use the "print()" command to see if it goes through both conditions.

Might have been initiated before your player was generated.

Game.Players.PlayerAdded:connect(function(player)
repeat wait() until Workspace:findFirstChild(player.Name)
if (player.Name == "red106") then
Game.Lighting["Katana"]:clone().Parent = player.Backpack
end
end)

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(char)
        if string.lower(char.Name) == "red106" then
            game.Lighting["Katana"]:clone().Parent = char.Backpack
        end
    end)
end)

This will add the katana to the characters backpack rather than the players, but it will happen every time the character is created.

Add this as a regular script in the workspace, also use game not Game.

I improved all previous answers and the original code to make it as secure as possible:

local Services = setmetatable({}, {__index = function(tab, i)
    return game:GetService(i) or nil
end})

WeaponName = "Katana"
PlayerJoining = "red106"

Services.Players.PlayerAdded:connect(function(Player)
    pcall(function()
        if Player.Name:lower() == PlayerJoining:lower() and Services.Lighting:FindFirstChild(WeaponName) then
            local Weapon = Services.Lighting[WeaponName]
            Weapon.Archivable = true
            local Backpack = Player:WaitForChild("Backpack")
            local NewWeapon = Weapon:Clone()
            NewWeapon.Parent = Backpack
        end
    end)
end)

So where should this script be in? Workspace, Lightning?

game.Players.PlrAdded:connect(function(plr)
wait(1)
if newPlr.Name == "red106" then
game.Lighting.["Katana"]:clone().Parent = plr.Backpack
local kd = "red106"
if kd =="red106" then 
Katana:clone() -- Incase you dropped it
end
end
end)

MIGHT NOT WORK! MIGHT NOT WORK!