how many meanings does the word along have?

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To follow another person or persons or to follow a concept. May also indicate you are following a linear path-- either physical like a path in the woods, or figurative path, like time.

"Along with" = Accompanied by

You can also use the expression "Run along" to tell someone to leave.

"Bob went along with Susan's dumb idea for the dance party."

"Bob went along with Susan to buy a disco ball."

"Annie ran away from home, along with her dog."

"The train makes three stops along the line from Boise to home."

"Somewhere along the line you'll have to tell him."

"I lost my watch somewhere along the path."

"Run along, Sally!"

"We're going to sing a song now. Everybody sing along!"