Hi cOSMografix,
please read this:
osm.wiki/FR:Key:wikipedia#Syntaxe
Merci, Alex

Hi gogo25171,
please read this:
osm.wiki/FR:Key:wikipedia#Syntaxe
NO: wikipedia=http..., YES: wikipedia=fr:Title,
For example here:
node/166904432
Thanks, Alex

Hi MaxA, please follow this guide: wikipedia=*#Examples
In short: wikipedia=en:Abcd, not http...
Thanks, Alex

Hi Pathumthani,
bitte verwende das Tag-Format hier:
osm.wiki/DE:Key:wikipedia?uselang=de#Bevorzugtes_Tagging
Danke, Alexander

Hi Maynewoods (again),
if the relation of a river already had a wikipedia-tag, then no extra tag for the river ways (members of relation) is needed.
Kind regards, Alexander

Hi Maynewoods,
could you please concider the format of wikipedia-tags described here:
wikipedia=*#Examples
Thanks, Alex

Hi, please consider wikipedia=*#Examples
in short: wikipedia without http...
Thx, Alex

Hi, please consider osm.wiki/FR:Key:wikipedia#Exemples
wikipedia=fr:Abcd
Thanks, Alex

Hi K.M., please read wikipedia=*
short: wikipedia and wikidata should not include http...
Thx, Alex

Hi, you added some new tags that show up here:
https://taginfo.openstreetmap.org/reports/characters_in_keys#problem
e.g. for this node:
node/9525125961
Could you please check this?
Thanks, Alex

Hi v., you added a tag "wikipedia"="9", but why? Kind regards, A.

Hi SethY861, please consider this: wikipedia=*#Examples
Nearly all other wikipedia-tags are like: "wikipedia"="lang:Abc Def" no http needed!
Thanks, Alex

Hi archimedes34,
please write "wikipedia=en:Name" not http.. (same for Wikidata).
wikipedia=*#Examples
Thanks, Alex

Hi Franck Durand Robin,
could you please consider this
osm.wiki/FR:Key:wikipedia#Syntaxe
Thanks, Alex

Thanks.

Hi schripp,
warum hast du meinen Hydrant um 200m verschoben (von unterhalb der Westhangtreppe zu oberhalb) ??
VG Alex

Hi Andrea Musuruane, I assume you are right. wikipedia=http...jpg is definitly wrong. I change it.
Thanks, Alexander

Hi Lee, ok.

Hi again, I like your suggestion. There is a another best-practice also satisfied by your choice: try to avoid unique keys.
Kind regards, Alexander

Hi Lee C., at least this key was listed as being a problem, here
https://taginfo.openstreetmap.org/reports/characters_in_keys#problem
Kind regards, Alexander