The "tool" I now use most frequently is an Optivisor. It goes on my head upon entering the workshop. I've not had it that long (relatively) but wish I had thought to get one much sooner.
Problem with "Beginners" articles is that once you get past the very basic stuff (which is widely available already) much of what you need to know starts to become quite specialised – as can the tools and tooling you need to do it. An obvious example would be clock making and repair. So to a large extent the type of work that interests a particular reader will influence what sort of tools and equipment they will need – and the knowledge required to use them well.
We are also fortunate to live at a time when the combination of cheap imports and relatively high disposable incomes (for some, not all) have made much of the old type of ME 'tool building' article a bit redundant because we have access to lathes, drills, mills – and their all accessories – such that few would bother to make them these days.
But if I was writing for the beginner – I think some of the following would still be useful;
– what to buy, why (& in what order) to buy it and how to best use it.
– what not to buy, why not and what are the possible better/cheaper/short-term alternatives
– how to manage (work around) when first starting out – without CNC, DROs or the latest thing in QCTPs etc.
– simple accessories to make, how to modify them for your particular use/needs – including simple projects based on readily available components – for instance incorporating ER blocks or spindles (that helps to simplify things) in your tooling.
Beyond that I think peoples needs probably become specialised and they will reach a level where they can begin to see their own ways forward…
Regards,
IanT