Hi @MKSodhi , 

If you're new to apache spark I would start with following book. You can get it for free from databricks site:

https://pages.databricks.com/202003-US-EB-Learning-Spark-2nd-Edition_01_Downloadpage.html

Next, you can setup account on databricks community edition. You'll get access to datbricks environment for free where you will be able to practice. 

If you work for company that is customer of datbricks, you can also apply for access to databricks academy, which has plenty of great learning materials. Last but not least, there are a lot of great yt channels like advancing analytics. Try to use them.