Some of the good resources I found to get a hold on the concepts:
https://www.geeksforgeeks.org/analysis-algorithm-set-4-master-method-solving-recurrences/
http://www.cs.cmu.edu/~rweba/algf09/solverecurrencesSF.pdf
https://stackoverflow.com/questions/46858401/time-complexity-and-recurrence-relation
After reading them thoroughly, solve previous year GATE questions on the topics, and the questions from any other coaching institutes' books like "Practice book for PSUs".
Practice is the only solution for getting a firm understanding of this topic.
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