While learning DSA, Recursion is the topic which will test you patience, attitude, passion for coding.
This is the topic which will prove to be the turning point in Problem Solving journey that you will start understanding concepts as mentioned Below :

Merge Sort
Quick Sort
Tree Traversal
Graph Traversal (DFS)
Dynamic Programming
Greedy Algorithms
...
This topic will require your "NEVER GIVE UP" attitude.
Also make sure before going through above mentioned topic you have learnt Recursion.

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Kunal Kushwaha (YouTube Channel) have explained it in the most basic way. It is highly recommended.

I'm super late to the party. Can you please help with a free course that helps understanding basics of DSA problem solving etc. ?

If you can tell me the data structure and Algorithms you are aware will be helpful to suggest you.

However in YouTube there are lots of videos on DSA playlist is available from scratch

Channels like

Pepcoding
NeetCode
Kunal Kushwaha

Will help you start from scratch

helpful

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