Hey Pavithra - while there are a bunch of courses being offered online (I had also taken a couple) - I have founder reading the blogs of the industry experts are a great way to understand the waters.
1. David Green -
https://www.linkedin.com/in/davidrgreen/
2. AIHR has some good materials -
https://www.aihr.com/hr-analytics-blog/
3. I had recently collated a lot of people metrics one can use -
https://www.notion.so/100-People-Metrics-Cheat-sheet-b3b87a8aeb01475fa9a6ebfe565074af
A good place to start would be to pick up any problem at work where decisions are being made based on Intuition; find data points around this problem and make a simple dashboard.
You will be surprised at the results simple visuals show.
Tools - when you are starting, stick to google sheets or excels and use their graphs.
Then, progress to Google Studios (by linking google sheets) to make dashboards.
For predictive - Python is the go to.