The National Archives website is a valid and reliable source for online research, particularly for historical documents, records, and government information. It is an official repository of important historical materials, making it a trusted resource for researchers, students, and anyone interested in history.
On the other hand, a weblog by someone who describes themselves as a “history nerd” may vary in credibility depending on several factors, including the author's expertise, the accuracy of the information presented, and the presence of citations or references to primary sources. While such blogs can provide unique insights or perspectives, they should be evaluated critically and corroborated with more authoritative sources, especially for academic or scholarly research.
In summary, use the National Archives as a primary source of reliable information, and approach personal blogs with caution and critical thinking.