XnView Software

I would like to do the following, preferably with a minimum of clicks

After selecting files:

1. add description to Caption
2. then automatically have that description added to Headline and Keywords
3. have the file renamed after Caption + shooting date (like: New playground-ddmmyyyy hhmmss.jpg)
4. Keep the modified date as per shooting date (if available, more than 90%)
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How am I to proceed ?

'Transfer' metadata is not better for you?

I don't think so, sorry.

My question was not clear, for which I apologize.

It should read:
1. select multiple files
2. CTRL-I (Edit Metadata)
3. in 'Caption" : enter free text (example: New Playground)

then..

when writing:
automatically add caption -> headline and keywords (New Playground added to headline and keywords
automatically rename file after caption
automatically rename after Caption + shooting date
(like: New playground-ddmmyyyy hhmmss.jpg - for example: DSC0001.JPG > New Playground-13102021 103510.jpg)
automatically change modified date to shooting date

within photo-managers this usually goes in a number of steps, a lot of clicks and accidentally skipping a step.

BUT...
Maybe this is not possible within XnViewMP - vainly searched for an article in the HELP files

no sorry it's not possible, perhaps you can do it with ExifTool