Automation run an action based off changes to a different sheet

[thebigJLT]

I am making an app for personal use that tracks inventory and usage of items. One form updates an inventory table upon saving the form. 

I have a separate table that also needs to be updated based on the form that updates the inventory table, but I have to run this action manually. I'd like this to be an automated process based on changes to the usage log table. I am having a hard time finding resources to solve my problem. I am completely new to this and have 0 coding and development experience.