The most common are 1st and 3rd person. 1st person is when you tell a story from your point of view, using the pronouns "I or we." And 3rd person is from an outside point of view, using the pronouns "he, she, and they." 2nd person isn't very common because it uses the pronoun "you," and makes the audience a character in the story. Hope this helps!
If you are planning to apply for employment with a particular company it is indeed important to research the company's background. The reason why you should be aware of a company's background before you apply is because it's going to effect you and you're professional techniques as you might have the expertise the company would need. If you research the background of a company and it matches you're ability of skills you will be more likely to apply to that company as it will be more beneficial to you and what you have to offer. That is why it is important to be aware of what you are applying for and be further more prepared.