MEAN Stack (acronym for: MongoDB, ExpressJS, AngularJS, NodeJS) Relationship entity diagrams will be created in SQL databases in programs such as Mysql Workbench and postgreSQL in addition to knowing the syntax of the language and working it by console in the same way, to be shown by the client with PHP through the different types of requests be handled in the same way with non-sql databases such as mongodb and firebase and create APIs with different methods in their controllers so that they can interact with it and fill collections of databases in JSON format.