Shinobi rankings
Genin -> low ranking shinobi. Receive D-rank missions, sometimes C-rank.
Chuunin -> Middle ranking Shinobi. Receive C-rank to B-rank missions.
Tokubetsu Jonin -> Specialised high ranking shinobi. Specialised in a certain skill.
Jonin -> high ranking shinobi -> Receive A-rank to even S-rank missions
Kage -> Shadow, reserved for the Kages. Sends shinobi their missions.
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Mission rankings.
D-rank: Assigned to genin fresh from the Academy. They pose almost no risk to the ninja's life and usually consist of odd jobs like farming and babysitting work. The reward for a D-rank mission is between 5,000 and 50,000 ryō.
C-rank: Assigned to more experienced genin or Chuunin. They are missions with little to no chance of combat against other ninja. Examples are guarding people against bandits or highwaymen, background investigations, eliminating or capturing bandits or thieves, and capturing or suppressing wild animals. The reward for a C-rank mission is between 30,000 and 100,000 ryō
B-rank: Assingned to experienced Chuunin. They are missions anticipated to involve combat with other ninja. Examples are guarding people, espionage, or killing other ninja. The reward for a B-rank mission is between 150,000 and 200,000 ryō.
A-rank: Assigned to jonin, concerning, among other things, village-or state-level matters and trends. Examples are guarding VIPs or suppressing ninja forces. The reward for an A-rank mission is between 150,000 and 1,000,000 ryō.
S-rank: Assigned to experienced jonin and concern state-level confidential matters. Examples are assassinating VIPs, and transporting highly classified documents. The reward for an S-rank mission is at minimum 1,000,000 ryō.
(A/N: Information is from Naruto fandom.)