Yes there are different online courses available for studying stock markets. Stock market is basically a place where shares of pubic listed companies are traded.

Kindly refer to this website to know more about these financial topics -

https://finance.careers360.com/articles/career-in-professional-courses-financial-markets

There are various courses avaialable online. You can refer to udemy, and some youtube videos like Vivek Bandra, etc.

Best wishes. Thank  you.