Shares are not mere pieces of paper. They represent part ownership of a business. So, when contemplating an investment, think like a prospective owner.
Warren BuffettWhat an investor needs is the ability to correctly evaluate selected businesses. Note that word โselectedโ: You don't have to be an expert on every company, or even many. You only have to be able to evaluate companies within your circle of competence. The size of that circle is not very important; knowing its boundaries, however, is vital.
Warren Buffett