Minecraft like block placement system?

I was playing Minecraft and I had an idea of a placement system. But I am stumped.

Problem: When placing blocks and the side of other blocks the go inside each other.

Sample Code:

local Player = game.Players.LocalPlay
local mos = Player:GetMouse()
local part = workspace.Part
local place = game.replicatedstorage.place

mos.Move:connect(function()
	Part.Position = mouse.Hit.p
end)

mouse.Clicked:Connect(function() --i know this dosnt work it will just give error. my place got corrupted so i have to remember all code
	palce:FireServer(mouse.Hit.p)
end)

The code isnt perfect but i have to type directly into the question box.

If you could help that would be AWSOME

Idk how to make grid tho... Insert a remote event to replicatedstorage. Then insert a server script in serverscript servicescriptservice. Then type this in the serverscript :

game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(Player, MousePos)
local Part = Instance.new("Part",workspace)
Part.Material = "Grass"
Part.Position = MousePos
Part.Anchored = true -- set it to true or false your choice
Part.Size = Vector3.new(5,5,5)
end)

then insert a local script to StarterPlayerScripts or StarterGui or StarterPack

then write this in the local script:

local Mouse = game.Players.LocalPlayer:GetMouse()

Mouse.Button1Down:Connect(function()
game.ReplicatedStorage.RemoteEvent:FireServer(Mouse.Hit.Position)
end)

I havent tested it yet tho Hope it helped :-)