Personal opinions ahead - your mileage may vary.
Lots of words, read at your own risk!
Assumption: you are talking about a Windows machine.
If you only need general purpose computing; email, web browsing, occasional document and spreadsheet, collecting photos off your phone/camera, watching streaming videos etc., then most any mainstream brand that you will find at Best Buy, Costco, Target etc. will be fine. The most important thing (my opinion) is specs.
CPU
In spite of the tempting prices, I would not get anything that has a CPU named Celeron, Pentium, Atom, N100, N200, etc. I would get a CPU named Intel Core or AMD Ryzen. Either one of those is fine, don't worry about which one is better. Intel Core i3 is the lowest end of that line, AMD Ryzen 3 is the lowest on that side. Personally, for reasonable longevity, I wouldn't get any lower than a Core i5 or Ryzen 5.
Memory
The base for most Windows systems these days is 8GB. This would be fine for general purpose computing. If the budget allows, I would jump it up to 12GB, again, mostly for longevity. However, if you do a lot of photo processing then 12GB might be the minimum.
DIsk
Again, don't let the siren call of bargain prices tempt you into only 256GB of disk (SSD) space. Get a minimum of 512GB. Depending on your needs, you might need more. If you're a photo hound, or you are scanning your life's worth of photos, you may need more. My photo library is about 24,000 pictures and videos and takes about 90GB of disk space.
Screen size:
This is the most subjective call. If you can visit a store and look at several different sizes, that's the easiest way to decide what you like. Given that we are "Senior" Forums, a 13" screen might be too small. 15" or 17" might be better, but you have to take into account whether you will travel with it, or sit with it on your lap, or it will spend most of its time sitting on a desk.
So, if it were me, I'd settle on the specs, Core i5 or Ryzen 5 with 8GB or 12GB of memory, a 512MB SSD; and then watch the sale papers until you find a price that suits your budget.
Right now. 2024-08-24, Best Buy has an HP - 15.6" Touch-Screen Laptop - AMD Ryzen 5 - 8GB Memory - 512GB SSD for $349. That's a pretty good deal.