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.