wondering how to achieve the page function in this example:
Working in
e.g. Wix Studio Editor
I have set up a page with 2 vertical sections and made a list in a column on the left hand section. Not sure if this list needs to be a menu in order to link to content that displays on the right hand column. Mainly - do not understand how best to set things up so that I can add content that changes to the right hand column. Help !!
Hi, @user6767 !!
I see. I took a look at the site, and this layout looks quite versatile and useful. I learned a lot from it as well! 
From what I can tell, the right side of the grid is probably built using Rich Content. As a first step, you should create a collection to store the Rich Content and add a field specifically for Rich Content. Then, add as many Rich Content items to the collection as you need. It’s also a good idea to give each Rich Content item a unique, identifiable title.
Once that’s done, the data preparation is complete. Next, add a Rich Content element to the page and connect it to a dataset that points to this collection. Then, you can use text or button clicks as triggers to switch which item (Rich Content) is loaded. This should complete the setup.
Most likely, you’ll want to handle this by changing the dataset filters. In that case, you can simply apply a filter based on the unique title. 
Also, after taking another look, I realized that it probably isn’t actually split into two grids. The menu on the left (or what looks like a stack of text elements) seems to be pinned to the page and floating. 
The reason I think this is that the behavior is the same whether you scroll on the right side or the left side. It looks like only the right side is scrolling, but in reality the entire page is scrolling—the left menu just appears fixed because it’s pinned. 
In other words, my conclusion is that you can reproduce the same behavior by placing the Rich Content on the right side of a single large section and pinning the menu on the left side to the page.