Cant set boldness with scripts

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#1 
local TitleText = Instance.new("TextLabel")
	TitleText.Parent = MAIN
	TitleText.Text = Title
	TitleText.BackgroundTransparency = 1
	TitleText.TextColor3 = Color3.new(1, 1, 1)
	TitleText.Name = "Title"
	TitleText.Size = UDim2.new(0.634, 0,0.262, 0)
	TitleText.Position = UDim2.new(0.238, 0,0.482, 0)
	TitleText.FontFace = Font.new("rbxassetid://12187364147") -- this works
	TitleText.TextScaled = true
	TitleText.FontFace.Weight = Enum.FontWeight.Bold --here
	TitleText.TextXAlignment = Enum.TextXAlignment.Left

This does not set the font weight

#2

You have to set the weight of the actual Font being created with Font.new, so you can do something like this

local font = Font.new("rbxassetid://12187364147")
font.Weight = Enum.FontWeight.Bold -- set the new font to bold
TitleText.FontFace = font

You can also set the font’s properties directly inside Font.new to shorten it a bit

local font = Font.new("rbxassetid://12187364147", Enum.FontWeight.Bold)
TitleText.FontFace = font
#3

what abour this

local TitleText = Instance.new("TextLabel")
	TitleText.Parent = MAIN
TitleText.RichText = true
	TitleText.Text = "<b>"..Title.."<b/>"
	TitleText.BackgroundTransparency = 1
	TitleText.TextColor3 = Color3.new(1, 1, 1)
	TitleText.Name = "Title"
	TitleText.Size = UDim2.new(0.634, 0,0.262, 0)
	TitleText.Position = UDim2.new(0.238, 0,0.482, 0)
	TitleText.FontFace = Font.new("rbxassetid://12187364147") -- this works
	TitleText.TextScaled = true
	TitleText.FontFace.Weight = Enum.FontWeight.Bold --here
	TitleText.TextXAlignment = Enum.TextXAlignment.Left