Did 18th century Caribbean Pirates have any real strategical ways of boarding a ship during a boarding party? Or was it just an all out fight where everyone would just jump on deck and start combat?

This is a big question, to an extent. The surest way to get a full answer is to read Benerson Little's Book The Sea Rover's Practice. But, you can get some of your answer from a question asked here before, Which weapons did pirates use during the Golden Age of Piracy (1650-1730)?. You also might be interested in the greater pirate history FAQ this subreddit has.