Nowadays, youtube channels have become my main resource.

I appreciate the fact that books are more reliable than videos thatwhich are made by people I don't know who made.

However, tThe history channels is full of attractive, however, are full of stimulating contents so that viewers won't get bored.

Most people want to know about interesting episodbits and pieces or grasp the big picture of history rather than knowremember the exact figurnames and namdates.

I reversed the order of figures and names because the next sentence gives examples in this order.

It doesn't matter who was the leader was of the rebellion or when it happened.

I have come to realize that books are not always truaccurate because it is hard to keep up with the latest research and exclude the authors' viewpointbiases.

そうですね。

Regarding that point, youtube channels provide objective opinions in the comments by which we can determine ifwhether the information is reliable or not.

Nowadays, yYoutube channels have become my main resource.

"Now, Youtube has become my main source of information for history." this makes it sound more natural

However, the history channels isare full of attractive contents so that viewers won't get bored.

"However, the history channels make their content interesting for their viewers." this makes it sound more natural

Most people want to knowsee interesting episodes or grasp the big picture of history rather than know the exact figures and names.

Nowadays, yYoutube channels becomeis my main resource.

because you're using "nowadays", presently youtube "is" your main resource.

I appreciate that books are more reliable than videos that I don't know who madewith questionable credibility.

However, the history channels isare full of attractive contents so that viewers won't get bored.

Most people want to knowwatch interesting episodes or grasp big picture of history rather than know the exact figures and names.

usually "watching" episodes

Regarding that point, youtube channels provide objectivehonest opinions in the comment by which we can determine if the information is reliable or not.

opinions are seen as subjective, perhaps honest opinions?