| Here are some of the concepts in no particular order. This is the quick list I came up based on my experience and usage. 1) RDBMS, NoSQL Concepts 2) Writing Queries and Joins 3) Connecting to Database native and ORM 4) HTTP Verbs like POST, GET, DELTE, PUT etc 5) Restful API and GraphQL Concepts 6) Session State, Application State, Caching and Safe Error Handling 7) Distributed Systems, SOA, Async Functions (i.e file handling) 8) Design Patterns, OOPs concepts (Abstraction, Interfaces etc) 9) Authentication, Authorization, Cryptography 10) Configuration, Minimum Privileges (e.g dbrole, server account etc) |