Beta Readers: The top four things to know
The ideal beta readers are people who read in your genre and would buy your book in the store, because they can offer insight into whether your story appeals to that general audience and whether it compares to other books they are reading.
No One Likes an Info-Dump. What They Are, How to Spot Them, And How to Fix Them, So Your Readers Keep Reading.
If the information is vital to the character—if it affects them or their world—it will also matter to the reader.