:GetDecestancs() Don't work properly?

local trees = workspace.Trees:GetDescendants()

trees.ClickDetector.MouseClick:Connect(function()
	drewno.Value = drewno.Value + 15 -- wood value is IntValue, I wrote this value earlier.
	wait(1)
end)

Why this not work? Is this by :GetDescendants()?

thats not how it works.

get descendants litteraly gets descendentS. how do you think it can return multiple values? It returns a table. so basically your script is table.ClickDetector whihc makes no sense. You have to loop through each individual part in the table and look for IT'S click detector. use a simple pairs loop for this.

local trees = workspace.Trees:GetDescendants()

for _,i in pairs(trees) do

	i.ClickDetector.MouseClick:Connect(function()
    		drewno.Value = drewno.Value + 15 -- wood value is IntValue, I wrote this value earlier.
    		wait(1)
	end)

end

althought this may work if you script it right (it works for me), its just a better idea to put a script in all those parts themselves and insert a script that says script.Parent.Clickdetector.Mouseclick, then just send over information using a value like a number value or anything that your trying to do.

PS. the reason why creating a clicked function for each part works is because no matter how you declare them, a function will always work from the moment they are delcared to when the game ends or the script with the function ends, so looping through actually creates a new function each time that triggers if it's corresponding part is clicked, simple.

i hope this helps.