There will definitely be some difficulty in the later stage, but the difficulty is acceptable.

Recommend a learning route for BS:

[☆] Java SE (Java basics, understanding process-oriented, object-oriented, set-oriented, multithreading, thread synchronization mechanism, reflection mechanism ...)

[☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆] MySQL, DML[ Modify], DQL[ Query], TCL[ Transaction Control] ...

[☆ ☆] JDBC (learning Java database connection. Jdbc is an excuse, and the implementation classes are provided by different database vendors, learning pessimistic locks, optimistic locking, etc. Learning three paradigms of database design, etc. ...

[☆]HTML+CSS+JavaScript: (front-end browser interface building)

[☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆9

[☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆9

Try to develop a Java BS website, such as BBS forum, address book, book management system, etc. ...