Metadata Question

I’m getting the message that “The page build failed for the main branch,” and I’m wondering if has to do with the metadata.

For collectionbuilder, is the only metadata fields you can have in your data are the ones listed on the website?

I want to create a mineral collection, so I was adding fields that include the physical properties of a mineral such as luster, hardens, and structure. Can I add fields?

I followed the step by step tutorial, but the page didn’t publish.
Thanks