After a couple of weeks of testing, revisiting this long thread, and frequent consultations of google, it is time for summary and conclusions.
It has been a true learning experience. Reading through the thread again, I now understand much more of the advice and suggestions offered.
The main objective of my project stays the same - learning in general, and finding out just how old and low specification hardware can be given a second life using Linux. The potential secondary objective has evolved somewhat, much due to input from friends who has neither interest in nor experience of linux, and often limited interest in computers in general. Just about everyone has a smartphone today. The smartphones have apps that are optimised for "heavy" applications such as YouTube and facebook. This reduces the need for a browser that can handle this type of sites. The objective for a computer then shifts into supplying a bigger screen and a proper keyboard for applications where this is beneficial.
I have tested nine different Puppies. Of the nine, I have decided to continue testing primarily with FocalPup32. It came out on top in close competition with GroovyPup32 and HirsutePup32. The final differentiating factor was that Focal Fossa will be supported until April 2025. Slacko Puppy 6.3.2 was a very good runner up to the winning trio and will also stay with me for some time.
A number of Puppies wer discarded for different reasons.
Devianpup 32 needed more RAM than the 512MB that my test rig is currently equipped with. It was just too slow. I like the look and feel of it though, so I might revisit it once I have upgraded with more RAM.
Precise Light 5.7.2 was very light indeed. Perhaps a bit too light. No browser included "Out of the Box", the built in utilities to download and install a browser were no longer supported and some of the programs I felt needed to be included were missing. Too bad, because it was very light on resources.
XenialPup 7.5 was a strong contender but lost out in "look and feel" to the top trio. It also lacked content in its help section, an important criteria to my secondary project objective.
ScPup32 also lost out in "look and feel" to the top trio. It also suffered from a word processor that wasn't working.
Last, but not least, BionicPup32 8.0 refused to set the correct screen resolution, no matter what I tried. That problem remains unsolved as this text is written.
I have rated the diffrent versions based on a number of different aspects, including size of the .iso file, RAM usage (idle and running a browser), functionality included "Out of the Box", how well it is updated, available documentation, look and feel, and the learning curve for a Windows user. The top trio rate more or less the same. They have reasonably small .iso files (<300MB), fairly low RAM usage (80-90MB idle, around 150MB running Light Web Browser), the most functionality "Out of the Box", they are all well updated, well documented and they have a very smooth and contemporary look and feel. They may not finish number one on the learning curve for Windows users, but the total score still put them ahead of the rest. The one factor that finally makes FocalPup32 the total winner is that Focal Fossa will be supported until April 2025.
With this summary I end this long thread by concluding that for me, FocalPup32 is the best 32 bit version with support beyond 2023. I will continue testing and I do have more questions, but they will get threads of their own.