yeah, it might have been source, not the website. I looked up an existing monument and website looked like a valid choice. 

as for data_utwor = * It should have been creation date or something of sorts, but yeah, was tired and forgot about it

as for `fop_id` and `gid` well, those are some identifiers and supposedly OSM encourages us to create new tags xD so i think those are okey and maybe someone gonna use it

thse are from this 
https://cdn.discordapp.com/attachments/783766269707026483/1173408240445440000/gdos_pominiki_przyrody_powierzchniowe.geojson?ex=68647315&is=68632195&hm=83326d3e706d71900a2b950911df4e85869582cfc448bd85ee963f5b5221cccb&

and you can confirm at  https://geoserwis.gdos.gov.pl/mapy/?usedesktop=true