Cultivation levels are based upon the understanding of natural laws, chakra's manipulation and usage and comprehension.
Beginner : one who is able to detect the presence of Chakra within their body is a beginner.
Rookie : one who is able to detect that Chakra is housed within a special organ called dantain is a rookie.
Pro : one who is able to realize that Chakra can be circulated in the body along the blood vessels is a pro.
King : one who is able to circulate Chakra along at least one limb to strengthen it is a king.
Lord : one who is able to strengthen all of their limbs by Chakra fortification is a lord.
Truelord : one who is able to project Chakra outside their body to fuel quirks, in other words, one who is able to use quirks is a truelord.
Overlord : one who is able to strengthen at least one of their senses besides all of limbs by Chakra fortification is an overlord.
Ancestor : one who is able to strengthen all senses besides all limbs via Chakra fortification is an ancestor.
Monarch : one who is able to partially condense Chakra around one's vitals to protect them is a monarch.
Eternal : one who is able to create a complete full body armor without using any quirks is an eternal.
Sovereign : one who is able to perform long-mid range attacks by utilizing Chakra as tangible projectile, comprehend the laws of nature and use them to his advantage i.e., create a domain without the use of quirks within which all the laws are dictated and decided by that person is a sovereign.
The realisation and comprehension involved in advancing in the path of cultivation cannot be given through external means and must arise within oneself in a natural manner. Forceful insertion of knowledge can result in crippling the person rather than helping him/her.