I'll assume you mean to say you know nothing about programming and the Arduino.
This Instructable is not suitable for someone who knows nothing.
Start with some simpler projects.
Find test or example programs for each of the pieces of hardware that will go into your final design and gather some experience using them in isolation.
Study and experiment with the basic examples in the IDE.
While doing that, take a closer look at the software that would go into the IKEA table and see if you can start identifying how the little bits and pieces are arranged to make a whole.
You are trying to run before you've begun to crawl. Choosing that Instructable as a starting point is bound to be frustrating.
Just read the comments there. You are not alone in finding that the instructions are clearly targeted at ppl who can meet the designer well more than halfway, and maybe even then would be hard to duplicate his success following.
This is all hard until it is easy. Do yourself a favor and put in the work it will take to begin from the beginning not jump into the ocean off a cliff.
HTH
a7