O god. Okay let's see. Gonna give you a bit of background first, to explain why i recommend what I do.
Forgotten Realms which is D&D's present prime universe takes place largely on Faerûn. This world is home to everything you see in the normal D&D books. It is closely tied to modern D&D, and this represented by massive in-lore world changes that take place at the start of each new numbered edition. Most recently being the Sundering, which spawned 5th edition. The Sundering ended the hundred years of the Spellplague where natural disasters and calamities ran rampant on the world (known as Toril). The Post-Sundering world is still relatively new to the lore, but I think you can easily find 20-30 novels in that range that are worth a read if you like fantasy.
The ones that i think would set you on the best course is a collection known as the Sundering series
https://forgottenrealms.fandom.com/w...ering_(series)
The reason is, this is a largely self-contained set of six novels by the six primary authors of modern forgotten realms. It starts with R.A. Salvatore (he is decisive in the fantasy novel world, largely because his flowery combat description at the cost of other depth) and his main hero from Forgotten Realms Drizzt. Drizzt as a character has led to many players wanting to play a "Dark Elf Ranger".
It ends with Ed Greenwood who is a founder of the universe, and his wizard Elminster is something else. This is a wizard who on multiple occasions has been in the equivalent of Hell, dead, and had sex with his goddess. I have met Greenwood and now know why his wizard is eccentric.
In the six books, you will be introduced to 6 different authors who all have different writing styles. Their stories take place at the same time (1484 Dale Reckoning - in game calendar), but all located in different parts of the world. This will expose you to many different races , deities and cultures. And if you like any of the books, i believe they each act as book 1 in the respective author next series. Is it the strongest set of novels in Forgotten Realms, no, but it will do a good job of introducing the universe, and introducing the authors who write in it.