QUES: d the categories of data concerned

correct the punctuation.

CORRECTED: (d) the categories of data concerned,

QUES: Find out about our job opportunities and how to apply

correct the punctuation.

CORRECTED: Find out about our job opportunities and how to apply.

QUES: When a company or business is doing well its stocks become a hot cake in the market and investors want to buy into it creating demand which drives up the stock values

correct the punctuation.

CORRECTED:
When a company or business is doing well, its stocks become a hot cake in the market and investors want to buy into it, creating demand which drives up the stock values.