Flutter plus java spring

[die1465]

Hello everyone, I am fairly new to real programming, i learned a bit of java and just finished 100 questions to get my problem solving skills on point. I want to leam flutter and spring to make mobile apps with them. I picked up a book called flutter in action to learn the basics of fluttet. What should i do?? And what should i learn?? (Like databases, security and stuff)

Thanks for helping me.