We have a discussion thread about the care of pearls:
https://www.pearl-guide.com/forum/showthread.php?51-Guide-to-Cleaning-and-Caring-for-Pearls
Caring for pearls isn't complicated, really.
1. Store them by themselves away from other jewelry or anything else that could scratch them. Nacre is soft and can be scratched by metal prongs, other gemstones, etc.
2. Put on your pearls last, after applying hair products or cosmetics. Perfume, hair spray, and lotions are all bad for nacre.
3. When you take them off, wipe them with a soft clean cloth before putting them away. You can also dampen your hand and run it loosely over the pearls before wiping them dry, if you were wearing lotion or if it was a hot sweaty day.
4. Restring them when the knots begin to look dirty or there are gaps between the pearls. Silk is weakened by wetness, skin oils, and general grime. Many of us do our own restringing, and there are tutorials on the Lowly Beaders forum.