Baeldung I've found to be fantastic for Java tricks and Java library usage. Geeksforgeeks blogspam really helped me with algorithm problems while preparing for

Baeldung I've found to be fantastic for Java tricks and Java library usage. Geeksforgeeks blogspam really helped me with algorithm problems while preparing for Leetcode-style interviews. I'd agree though that w3schools and tutorialspoint do as much harm as good.