Since the colonists are fighting on their own ground they know the land very well. They also know where to go to avoid the British and sneak to attack them
At the battle of Bunker Hill General Washington told his troops not to fire until they saw the whites of the British troops eyes. This strategy helped them bring down the British.
Get the supplies
The Continental Army had an alliance with the French. The French brought them the supplies they nedded to win the war. They fought with them on land and on ships. The Marquis de Lafayette was the main French men that became a leadig General in the War.
The troops fighting with the British were highly skilled and ready for battle. Not only were they good on land but the navy was also very expirienced.
The British had access to variety of supplies to use in the war. They also had 80,000 troops fighting with them
The British had a strong central government telling them what to do in the war. THey made the decisions to give them the supplies needed for the war.