That depends of what you want to build, PHP + Mysql is full easy you can start with that. React is not a backend language and firebase is a BaaS (Backend as a service) you should start with an SQL database because is more easy to make querys.
If you do not want to work with php you can use NestJs(a nodejs framework) is extremely easy to learn and more if you know Angular.
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That depends of what you want to build, PHP + Mysql is full easy you can start with that. React is not a backend language and firebase is a BaaS (Backend as a service) you should start with an SQL database because is more easy to make querys.
If you do not want to work with php you can use NestJs(a nodejs framework) is extremely easy to learn and more if you know Angular.