I don’t know their product but I really find vlaue in reading their blog / documentation / academy and amazing “how-to”. It’s really very well explained for people without IT background and the documentation is really well written.
Really helps when it comes to databases.
https://vertabelo.com/blog/example_er_diagrams/
https://vertabelo.com/blog/design_patterns/
https://vertabelo.com/blog/design_fundamentals/