What happened before/what caused the Boston Massacre?

Before the Boston Massacre the British had created a number of new taxes on the American Colonies, which include taxes on tea, paper, and lead. the Boston Massacre occurred when British soldiers in Boston shot a group of colonists, killing 5 people (while under the harassment of locals).

The British has instituted a number of new taxes on the American colonies including taxes in tea, glass, paper, paint and lead.