It's never easy to know what another will like as to books.
I've been reading 4-5 books per week for well over thirty years. From the classics in my earlier years (Mortimer Adlers list of the Great Books [from, How To Read A Book given me by a neighbor when a teenager; still not finished), to a ton of thrillers and such as my energy/skills decline due to failing health there is no end to it as there is with shallow television and the rest. Maybe you'll find my experience of help.
Cautions: Beware of the best seller list, in general. Most are poorly done and little more than TV substitute. Avoid books "written" by more than one author (such as an autobiography ghosted by another; or a series in fiction); remember that even good writers tend to only have one, maybe three good books in them. Anything more is just a franchise in all but a handful of cases. Make talent a priority.
Get your library card ready. Have a list of used bookstores for your area for the moments when you have a moment.
Lists which are helpful include the prizewinners of various organizations: the Nobel, the Pulitzer, etc. Each genre tends to have one (for mysterys, the Edgar). You may, as have I, find a few good authors this way. I searched the Internet for these. "Great Books of the 20th Century" is another search, by several groups, American, European, etc. Pretty well no losers on those lists.
My rules of thumb at the library are fairly simple for authors unknown to me:
Number One, a review by the papers of NY, LA, DC, etc means it isn't dross. A "named" review from the NY Times/NY Review of Books is gold (as are those from other major reviews; the reviewer is named). Thousands of books are published yearly, and, as a reader it is to be hoped that the better books are noted by the various reviews and reviewers.
As to reviewers there are those for whom it is a part livelihood. Nelson DeMille is a mediocre writer who in turn never met a book he didn't like, sort of like Gene Shalit and movies. You can likely find his "!!" on dozens of recent books. Shills abound.
So, Number Two: As I was impressed by author George Pelecanos (recommend him to anyone; my one recommendation to you), and I see that a blurb from him is on the jacket of a book by an author with whom I'm unfamiliar, I'll give it a shot.
Number Three is to see if the story as re-capped in the flyleaf interests me. Some don't. But whether or not I think I might like it is the last, and by far the least important decision in choosing a book. A strong review, a strong reviewer, the blurb of a good author weigh more in the process.
A good list I'm currently working from is the US Marine Corps recommendations for all enlisted personnel and officers. Those I haven't read previously I'm trying to get through before my mind/energy decline further . . my son recently accepted his commission in the USMC.
Reading can be for pleasure (97% of those who call themselves readers fall into this category), it can be for information (hopefully outside ones livelihood), and for knowledge. I can best recommend that one pushes oneself from time to time, to try something new. I am no whiz in science, only adequate, but since college have greatly enjoyed what is termed "hard" science fiction (Charles Sheffield for example) as it has broadened my ideas of "the possible".
In the end, reading ought to open that door, of what may be possible.
Good luck.