For a good amount of time now, I have been witnessing history pages popping up in the light of politics and religion claiming to be "researchers" (which is an insult to researchers who spend their entire life in reading and understanding history and have degrees) and people actually believing every word that these pages, websites and people say. So here is my own brief understanding of how to actually "read" history.
1. Find a topic (can be an event, a person, a dynasty)
2. Look up popular writers on the topic. (Check out their international recognitions, degrees and area of expertise)
3. Look up books with good reviews.
4. Pick your book. Make sure it has a reference and a Bibliography given.
5. Cross-check facts with the references given. Read up on the books given in the bibliography.
6. Repeat steps 4 and 5 for the next book.
7. If you are reading about dynasties, make sure you read their contemporary accounts, in the earliest possible translation and modern translation, both.
8. Make sure you read other contemporary versions, especially those of the enemies, i.e. Rajput or Maratha in case of Mughals, Bengal in case of Marathas.
9. If you read European accounts in the case of Indian History, read the European social structure of the time to understand their mentality towards the idea of the subcontinent. Women in power, society in India, etc. that impacted their short-sightedness at the westernised version of totally different things like the Harem.
10. Historians may agree or disagree on a cause of war, its result or the character of a person, but reading different versions will help you extract the most common outcome.
Ps. It takes a lot of time to read and understand History. Do not rely on Google, Wikipedia, YouTube or any books without source citations. History is not black and white; there are no heroes and villains, just human beings.