How do you make an inventory?

I have been trying for a very long time to make an inventory. I am a moderate scriptwriter but am still learning. I would be very pleased if someone could help me.

Read https://scriptinghelpers.org/help/how-post-good-questions-answers before asking questions.

Ask vague questions, get vague answers.

The Inventory is already made in roblox, and you just need to insert tools into the "backpack" section of the player.