How can i make a Skill tree?

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Good question, you can use the objects in a server script to tell the server how to handle skill objects and the associating logic.

First, you would need to require the module script, I would do it like so:

--Points to the module script in the workspace
local SkillPointer = ReplicatedStorage.Source.ObjectFolder.SkillObject
local SkillObject = require(SkillPointer)

Using the example script I gave I would initialize the first skill object which would be the start of a skill tree, let’s call it some weird name:

local Name = "XXx_SlayerHunting_xXX"
local HuntingSkill = SkillObject.new(Name)

Then you would create another skill that is up the skill tree lets call it beast slaying

local Name = "BeastSlayingSkill"
--Random units could represent exp in a game
local BeastSlayingUnlockExpCost = 10000
--Skills required before unlocking this new skill
local SkillsRequiredTable = {HuntingSkill}
local BeastSlayingSkill = SkillObject.new(Name,BeastSlayingUnlockCost,SkillsRequiredTable)

Then lets take an example usage of a skill tree usage in a GUI, where we unlock a button, this would be the pseudo-code required that uses an object-oriented style fancy thing

--Probably use a remote event
some gui on button press on the beast slaying skill unlock event do this(

--Event should return the player who is trying to unlock the skill
function(Player)

    --Player is the person who clicked the skill unlock button
    
    --Checks if the player has the previous skill object
    BeastSlayingSkill:CheckRequirementsAndUnlockForPlayer(Player)

    --Gives the player the skill
    BeastSlayingSkill:GivePlayerAbility(Player)
    
end)

Now that this general concept is written you can further improve and generalize it. I hope this helps with object-oriented programming.

Edit: Within the object for the unlock, you can implement a data store check,

I recommend looking at this tutorial, for ideas.

Edit: Hmm after some researching I found an skill tree libary GUI made using React, a java script libary for making UI.

Perhaps you can replicate it in Roblox using Roact instead?

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