There are many sources of "help" documentation and other resources for Word.
  • Find the Word Help withiin the application and read some of the help documentation on Tables.
  • Google "help for Word Tables". Using Google this way is often a very effective way of getting help on a specific topic.There is help and training on the Microsoft Web Site.

There are other sources:
  • Some Youtube videos
  • Some Web sites devoted to Word
  • The section on MS Word in Wikipedia
But first master the basics of Word before studying tutorials with more elaborated content.