Mongo

https://www.mongodb.com/blog/post/6-rules-of-thumb-for-mongodb-schema-design-part-1 - great series on schema design

https://www.mongodb.com/blog/post/thinking-documents-part-1 - comparision to relational

http://learnmongodbthehardway.com/schema/schemabasics/

https://cloudnweb.dev/2019/11/learn-mongodb-aggregation-with-real-world-example/ - query help

https://docs.mongodb.com/manual/tutorial/ - official tutorial list