Shares and securities – reorganisations and takeover

Hello, I hope you are all well.

I was just wondering how often shares and securities are examined? I find them very confusing and I really want to leave them out as I am wasting a lot of time trying to understand them instead of using this time to revise the rest of the material. I know we should be prepared for everything but still… how safe is it to not cover shares and securities (both for individuals and companies)?

Thank you.