Hello! Please notice the difference between langauge code (ja) and country code (JP) for japan.

Hello! Please have a look on relation/3787114, relation/3789070. What is the mean of the tag
dark_sky:website. Did you mean url:darksky (correctly url:dark_sky)? See https://taginfo.osm.org/search?q=dark .

Welcome to OSM! Please find out about the correct labelling that is required. I'm not sure if every house is directly a hamlet.

A very interesting art form. I haven't been able to find any comparable notation either. Could you imagine adding this key to the forum or wiki?

Hello! Please have a look on way/390137524. what is the mean of the tags
járhatóság = benőtt
járhatóság2 = nehezen járható
?

Welcome to OSM! Please we use the key highway for every (!) type of path.

Hello! Please have a look on node/13121401892. what is the mean of the tags
CBTC = BitcoinBH
OBTC = UAIBIT
PBTC = https://i.ibb.co/DPLFJ26j/MASKARA.png
?

Hello (again)! Please have a look on http://overpass-turbo.eu/?Q=%5Bout%3Ajson%5D%3B%28node%5B%22FUNGSIKWS%22%5D%3Bway%5B%22FUNGSIKWS%22%5D%3B%3E%3Brel%5B%22FUNGSIKWS%22%5D%3B%29%3Bout%20meta%3B&C=-0.001116%3B102.437639%3B14&R= . What is the mean of the tags
FCODE = SM
FUNGSIKWS = 100220
KODE_PROV = 14
LSKKWS = 5406992.0
METADATA = KWSHUTAN_AR_250K
NAMOBJ = Suaka Margasatwa
NOSKKWS = 903/MENLHK/SETJEN/PLA.2/12/2016
NO_REG = 0
REMARK = Peta Perkembangan Pengukuhan Kawasan Hutan Tahun 2020 (SK.6612/MENLHK-PKTL/KUH/PLA.2/10/2021)
SRS_ID = -
TGLSKKWS = 2016-12-07
?

Hello!Please have a look on node/393132326. what is the mean of the tag yarn_bomb = yes?

Hello! Please have a look on way/697688738. what is the mean of the tag addr:p = с/т Раздолье?

Hello! Please have a look on way/1198062134. what is the mean of the tag Maxx = yes?

Hello! Please have a look on way/1427024687, way/1427023952. what is the mean of the tag 9 = 9/4/2025?

Welcome to OSM! You add the key AED. Did you mean emergency=defibrillator ?

Hello! Please have a look on node/7932078727 (one of six nodes). What is the mean of the tags 2bis = 2021?

Hello, this is useful information. Do you recognise the website osm.wiki/Advertising? It seems to me that there are already corresponding keys. Please also note that at least the keys should be in British English.

Hello! Please have a look on way/144670889 (one of thirty-five ways). What is the mean of the tag maxweightratingČhgv = 7.5? Did you mean maxweightrating:hgv = 7.5?

Hello! Please have a look on http://overpass-turbo.eu/s/2b7Y. What is the mean of the tags
Feeder_Cod = ASBT227
Feeder_Nam = TPEN 1822 - T2 DRIV K08
Line_Cable = Cable
Operating_ = 33 SBT
?

Hello! For better description of your object, please have a look on osm.wiki/Key%3Aheritage

Hello! Please have a look on way/1426837710. what is the mean of the key Tip_RK?

If you need help, You are welcome!