java is always a choice of company because all new tools like hadoop is operated by advance java
web development is also very common requirement in company because new technology made work easy like node react and angular javascript
android is also used concept of Java
python is also a good choice because machine learning and artificial intelligence both are growing and they require python devs
What is your goal ???
Take a look at job requirements and focus on those. Yes knowing a few languages and frameworks will help in securing a job and beating the competition.
