How to make a grid on your baseplate?

So first, you could either go a few ways,

1. Get a decal, Paste it on a tile and use that as a grid or,
2. create parts and align them to make a grid or...
3. create beams from one end to another to create grids!
4. There are many ways to go actually, if you post code I will get into more depth!

A grid system is pretty good for placement games btw

here is a rough example that I randomly just created:

local rows = 5 -- set to X length
local columns = 5 -- set to Z length
local counter = 10 -- set to the grid size
local start = Vector3.new(0,0,0)
repeat wait()
    local new = Instance.new("Part")
    new.Parent = workspace
    new.Position = start
    new.Size = Vector3.new(5,5,5)
    new.Position = start + Vector3.new(rows,0,columns)
    new.Name = "Position_Grid"
    counter = counter - 1
until counter < 1

Hopefully this helped you, goodbye!