Danish State Archives is on Facebook: Link to site
Histories of places in Denmark: http://www.landsbyhistorier.dk/
Search local history archives in one place: https://www.arkiv.dk/soeg. An article describing Provincial archives appears on Ancestor Cloud
Search on "Lokalarkiver [name of place].
Records of the General Superintendent: https://www.sa.dk/ao-soegesider/da/other/index-creator/143/112373/19643855