they are created by people who have never experienced the historical period they described
A primary source is a source that has seen the event you're researching first hand and has either spoken with you or wrote a book about what they saw. A Secondary source is a source that has known somone who has seen the event and has told them about it. The advantages of a primary source first and foremost is the accuracy of the story. I don't really know of any disadvantages. The Advantages of a Secondary source is that they could propose a new idea or look at the event from a different point of view or study the many different aspects of the event that occured. The disadvantage may be the lack of accuracy because many just do a little research and think they can write a book on it.
The advantages of having a biography as a secondary source is that less time consuming and costly to use. A disadvantage is that the quality may not be good and additional sources may be needed to get different viewpoints.
is pericles primary source or secondary source
It is a primary source.
What are the advantages and disadvantages of the close source software ?
No, an encyclopedia is a secondary source.
it is a primary source
It is a secondary source.
Secondary source
secondary
Primary
Primary Source