How do skill-ups work?

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Active Skills have levels. How does one level them up? What does levelling them up do?
Most specifically, is it true that "if a monster is Ultimate Evolved, you will get a guaranteed Skill Up when you feed it a monster that's Lv 99 and with the same ID"? Those are suspiciously specific conditions.
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How do skill ups work in Summoners war?
There are two ways to level up a skill: Power-up or evolve using a monster of the same family. E.g. Powering-up a Fairy (Water) using a Fairy (Light) will increase the level of any of the skills of the Water Fairy. Note that unawakened monsters can be used to power-up skills gained upon awakening.What does skill up mean?
SkillUP is a free program that helps Food Stamp (SNAP) recipients get help with skills, training, and employer connections to get a job (or a better job). A SkillUP job coach will work with you to create an individual plan to help you reach your goals and start a new career.How do you power-up monster skills in Summoners war?
There are two ways to power-up monster skills:Skill Up Guide for Every Champion I Raid Shadow Legends
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Images: Eva Bronzini, cottonbro, Ksenia Chernaya, Ksenia Chernaya