• OK, in the interests of - as you say - contributing some useful info to this shared resource, and reversing my own petulance in deleting the link to the beginner's guide I posted above, here is a literal step-by-step guide: https://learnosm.org/en/beginner/start-osm/ that starts with 'open your browser' and gets you as far as editing tags - in your case, surface.

    You will then need to read https://wiki.openstreetmap.org/wiki/Key:surface and choose a suitable value. It shouldn't take more than 5 minutes to get this far for someone with a technical background.

  • Ok, so I've managed to tweak a road from unknown to unsealed, grade 3.

    There's another I'd like to change, but not the whole length of it. It has points where it joins other roads and becomes tarmac at that point, but I've tried all the splitting options and all the usual selection stuff but it doesn't seem to want to apply 'unsealed' to one section of the line and 'tarmac' to the other. Is there some trick to splitting a road?

  • Yes, you would need to split the road then apply the 'unsealed' attribute to one of the parts. You split lines (roads etc) at nodes: select a node then right click, should be a scissors icon. Create a new node first if there's not one where the surface changes.

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