I've used Content Blocks before but I felt it was too clunky. UI/UX needs work. And at times, too much. I looked at Structures but it didn't work on 2.7. Fred didn't work on my site either, it came up blank. So I saw this article. https://docs.modx.com/extras/revo/migx/migx.tutorials/migx.varying-layout-boxes/migx.varying-layout-boxes.configurator-version
Using this technique, you can build your own content builder that functions very well. You can build your own layouts, fields, etc and use chunks to display them. I find it cleaner and leaner because I have specific needs, that I can build for. It's perfect. Thanks Bruno!