Welcome to the fabulous world of nail care (& polish ❤️)!! One of the most valuable things I've learned is that many of us need to balance 2 things to maintain intact nails: strength & flexibility.
Strength makes sense & there are a lot of nail "strengthers" on the market that will harden your nail. (One popular one is OPI Nail Envy. Just keeping any polish--even just a clear coat-- on the nail also gives strength). The problem is that with longtime use of nail strengthers, the nails may become too hard or brittle, making them prone to cracking or chipping when lightly stressed, like bumping your nails on a table. This is why flexibilty is important. Strong, *flexible* nails are less likely to crack or break when stressed.
Flexibility can be gained by using a moisturizer (lotion, creme or oil) on your nails and the skin around your nails. **You don't nead to buy a special nail or cuticle creme/oil** (any lotion or even olive oil will work), but it can be a nice motivator to have a few lovely smelling ones in your bag or desk to get in the habit. If you like lemon scents there are 2 popular cuticle cremes: Lush Lemony Flutter & Burt Bees Lemon Butter Cuticle Cream. A place like Sally Beauty will have a variety of scented cuticle cremes in chapstick-like twist tubes, as well as oils in nail polish size bottles and pens. Their house brand BeautySecrets has an almond-scented oil that comes in a nail polish sized bottle. I've tried so many & usually keep the old pens to refill with jojoba oil & sometimes, a fragrance oil.
I automatically apply something to my nails/cuticles 2x a day -- right after i put on my face creme, but I *try* to do once during the day when I remember. (I used to be a nail biter, so that little bit of nail and skin TLC helped me quit). I like using a fast absorbing oil bc I can put a drop *under my nail* where it will be absorbed into the nail (particularly important if you're wearing gel nail polish, though nail scientist Doug Schoen has said it's still beneficial to be moisturizing the top of the nail plate & surrounding skin when wearing polish and gel polish).
There are SO many products and reviews out there that it can be overwhelming and expensive. You DO NOT have to buy a lot of products to have nice nails. It really helps if you can learn a little bit about how & why a product works.... YouTuber Christine from SimplyNailogical has a (long) video that talks more about the above with some tips and (inexpensive) product recommendations:
Disclaimer: I am not affiliated with any beauty blogger or website. I've just been a nail care & polish nut for a looooong time