Anything is quite easy to learn if one is genuinely interested in it.
While the terms and concepts can be a bit tricky, starting from the very basics can help you along the way.
There are three different markets where you can trade. Equities, Futures and Options. Since F&O (Futures and Options) instruments are essentially based on the underlying equities, it’ll be better if you make yourself comfortable with the basics of equities market, initially. This shall include terminologies, trading concepts and settlement system.