The schematics editor will help you create buildings! It will also help preserve those buildings, in case you ever need to reset your world or in case of data loss. Better yet, you don't need for coding experience to use it.
Here's a video about how it works: https://www.youtube.com/watch?v=UMy4Gw4-kW8
Any edits you make should save automatically every 30 seconds. Pressing ctrl will activate the 360 degree perspective.
If the blocks appear black
Make sure the vox-l artifact is enabled (located in the artifacts shop). It's also possible you were redirected to the http:// site by mistake. Type https://mod.learntomod.com/schematics into the url field not http:// and if that doesn't solve it, try switching browsers, in case there's a browser plugin or setting interfering. It could also be a firewall issue.