What investment approach does Warren Buffett follow?

According to Warren Buffett's investment philosophy, what should investors primarily focus on?

Which financial metric does Warren Buffett use to assess a company's profitability and efficiency?

What type of companies does Warren Buffett typically avoid investing in?

What is Warren Buffett's preferred investment strategy?

What is Warren Buffett's perspective on diversification in an investment portfolio?

What is Warren Buffett's advice regarding market news and short-term stock performance?