Resources:
Sample package.xml file - https://developer.salesforce.com/docs/atlas.en-us.api_meta.meta/api_meta/manifest_samples.htm
Metadata Types - https://developer.salesforce.com/docs/atlas.en-us.api_meta.meta/api_meta/meta_types_list.htm
Resource:
Metadata Coverage Report - https://developer.salesforce.com/docs/metadata-coverage/48