Like FreddyHeadey I use a 10" tablet for browsing - e.g. ordering from Amazon. My on-screen keyboard takes up about a quarter of the screen but can be changed and made bigger:
Screenshot 1   Screenshot 2

Changing and resizing keyboards is a standard feature of Amazon tablets and phones (and almost certainly of iPads/iPhones).

If I had difficulty with the on-screen keyboard I would use a separate one. These are also quite common. I had one once - it attached to the tablet magnetically and folded to form its cover: very neat. You can attach a standard bluetooth keyboard to Android tablets.

I have a phone but I very rarely use it with the browser. I want it small enough to go in my pocket . I use it as a phone, and to text. The only apps I use are for travel - trains, buses, and maps.