Joining elements vs. sentences

AND (conjunction)	IN ADDITION (sentence adverb)
The conjunction and, and also, or as well as joins two sentence elements such as two nouns, two verbs, two adjectives, two phrases or two  clauses (two same word forms).  When and connects two items, NO COMMA is used.  When three or more elements are joined, a comma is used.  See comma series	In addition, additionally or also, joins two sentences (indepensent clause.)  The word introduces additional information.  These words are often called transition words or conjunctive adverbs.  (Also tends to be less formal than in addition or additionally).
Anne is an actress.  Normally, she acts and sings.    (verbs)	Anne and Alex act and sing.  In addition, they dance.
Anne loves dance and also music.   (nouns)	Anne and Alex are very strong dancers.  Also, they have years of experience dancing together.
She will compete in ballroom and also modern dance.  (adjectives)	Anne and Alex will learn samba and cha cha.  Additionally, they will try merengue.
She must dance gracefully and precisely in order to win.  (adverbs)	She must dance gracefully.  In addition, she must dance precisely.
She must follow the rules as well as use good dance technique.   (phrases)	She must follow the rules. Also, she must use proper dance technique.
The judges want her to extend and to point her toes.  (phrases)	The judges want her to extend her arms.  Additionally, they expect her to point her toes.
Anne is a woman who knows her strengths and who will give her best effort.    (clauses)	Alex is a man who knows his strengths. †And he will give his best effort.