Primary resources include things such as diaries, receipts, tickets, pictures, clothing, personal recounts and artifacts. Primary evidence can be subjective and can be something like a first hand report. A historian is required to be objective, impartial, detailed, comprehensive, detached, and scholarly. Yet they can never be completely impartial since it is their own biases which gives interest to what one is reading. History is a matter of interpretation of past events and records by historians who make history come together and come alive.
Historical facts are events that really occurred and have no life or meaning on their own.
Historical facts need to be brought to life in history books or they will simply vanish as did many oral histories. A historian can never collect all of the facts and evidence regarding an event. History will always have gaps and will never be the complete story. Even if a person was to repeat all of the same events which occurred they would not be able to predict the result since each situation is unique. History is always being rewritten by new generation giving different perspectives and values and redefining history in their own interests.