Hi, my name is deborah275! Help with computers

I have MS & was diagnosed 17 years ago. That was when home computers were rare & iphones a thing off tmrw's world 🥺 I have found it an uphill struggle to become computer literate at the time my kids were  very young & my partner. knows nothing about conputers & doesn't want to (different generation). The upshot of this is my knowledge is very limited. Can anyone recommed a self-help book simple enough for someone like me. I feel like I'm losing the will to live 😬