Front-end development, back-end development and database development.
Technologies to be learned in the front end: htmlcssjsjqueryeasyuiboostrap These are the basic technologies, and only by mastering these can we learn front-end frameworks such as vuenode.
Technologies to be learned at the back end: back-end frameworks such as springspringmvcmybits and javajavaweb learned after mastering these two basic languages.
Database development needs learning: unified modeling of sql language uml
Only by mastering these can we begin to develop! So there is still some difficulty, and you need to make up your mind to learn well.