Learn Russian: Этот мужик чинит машины лучше всех.

Мужчина is the standard, neutral word for "man," while мужик is colloquial and informal. Depending on the context, it translates closer to "guy" or "dude," or it implies a stereotypically handy, tough, or ordinary man. Here, it gives the sentence a casual, conversational tone.

How does the phrase лучше всех express "better than anyone"?

Russian often expresses superlative meanings (the best, the fastest, etc.) by combining a comparative word with всех (the Genitive plural of все, meaning "of all"). So лучше всех literally means "better of all," which translates naturally to "the best" or "better than anyone."

The English translation says "That guy," but doesn't этот mean "this"?

Technically yes, but Russian uses этот much more liberally than English uses "this." In conversation, if you are bringing up a person or object that is the current topic (even if they aren't physically nearby), этот is the natural word to use. Translating it as "that" often sounds much more natural in English context.

Why is the imperfective verb чинит used here instead of a perfective form?

The imperfective чинить is used because the sentence describes a general, ongoing skill or habit. He fixes cars in general. If the sentence was about him successfully completing a repair on one specific car, you would use the perfective form: Он починил эту машину (He fixed that car).