Here is a breakdown list of a lot of the challenges.
MonochromeMonday - initiated by @old-guy-photos - MonochromeMonday
TreeTuesday - initiated by @old-guy-photos - TreeTuesday
BeachWednesday - initiated by @uwelang - BeachWednesday
SunThursday - initiated by @uwelang - SunThursday
LoveFriday - initiated by @liliana.duarte - LoveFriday
EscapeSaturday - initiated by @alinabarbu - EscapeSaturday
BeautifulSunday - initiated by @ace108 - BeautifulSunday
Colorchallenge (with daily color tags) - initiated by @kalemandra - ColorChallenge
SteemitPhotoChallenge(on weekly basis) - initiated by @jamtaylor - SteemitPhotoChallenge
Travel Map initiated by @lizanomadsoul - TravelMap
Just go to those hashtags and you will see a lot of people posting and how they post. You can look at my blog and see how I manage my challenges.
Nice list. Are all of these photo challenges?
By the way, the Steemit Photo Challenge is now every two weeks. More time per topic =)
Yeah they are all pretty much photo challenges.