Hi micara, Its depends on your capabilities. Their are frontend devleopers courses like java jscript, python, react js and full stack developer. Back end courses like devops with Aws or Azure or Gcp, networking, linux admin,testing and DB administrator. May be like i can advice you that go for core java. It doesn't mean that you will succeed and get the job. No one can give surity. Do research on courses. First watch free you tube videos regarding the selected course. Based on that you can go a head. All the best 👍
My personal suggestion is first go with one course. After one month if every thing works as expected then go for other course simultaneously. All the best 👍