Best Free Resources for a Software developer

Hi, As per my research i have added few useful resources which i generally used to learn and to do my preparation.

Great resource for a learning:

1. geeksforgeeks: here you can learn multiple coding language and coding concepts.

2. w3school : this is the one of the best free online learning resource

Some of the best youtube channels for preparation.

1. java concept and java concurrency

2. system design (LLD & HLD)

3. data structure and algorithms

To do coding practice, there is lot's of website available to do a coding practice.

1. hackerrank: this is more suitable for a beginner level programmer.

2. hackerearth: this can be used for coding practice, and here you can give test of varies companies. and contests.

3. leetcode : this website can be used for beginner to advance

4. codechef : for competitive programming

5. codeforces : this is also for competitive programming.

these are the best few free learning resource for a software developer preparation.