No basic and complete Big Sur guide

I'm totally lost here.
I've been hackentoshing over a decade and never had a problem following the guides on this site but it seems to have lost its way while I was away using a cheap secondhand MacPro 5,1. There is no comprehensive, generic and working step-by-step guide to making an installer and getting a reference machine working.

Could some of the old hands please look at the situation and look at some of the older install guides.

The Big Sur downloaders no longer work as assumed in...

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Author: Smellybeard