No one cares what you were 'taught' by some idiot on youtube.

Effect of a plant-based, low-fat diet versus an animal-based, ketogenic diet on ad libitum energy intake
https://www.nature.com/articles/s41591-020-01209-1

This was a short-term dietary ward experiment. Even though the keto diet groups lost ~0.7 lb more weight (Fig 2g), they lost ~1.5 lb more lean mass (Fig 2h) and ended up with ~1 lb more fat mass relative to the low-fat diet groups (Fig 2i). The keto diet groups did worse across the board in terms of health bio-markers. Basically keto resulted in significantly higher cholesterol, reduced insulin sensitivity, higher uric acid, impaired thyroid function and being skinny-fat. And all of that in less than a month. No wonder the idiots who advocate for it also advocate starving to try to compensate.

Ketogenic Diets and Chronic Disease: Weighing the Benefits Against the Riskshttps://www.frontiersin.org/articles/10.3389/fnut.2021.702802/

"Given often-temporary improvements, unfavorable effects on dietary intake, and inadequate data demonstrating long-term safety, for most individuals, the risks of ketogenic diets may outweigh the benefits."

Regarding keto, there is literally no legitimate research showing long-term health benefits from following this idiotic eating pattern, and what little research there is suggests it can be harmful long-term. That is why no professional nutrition or dietetics association recommends it, and most actially caution against it.

Regarding intermittant fasting, as noted in the previous comment, the most common form is eating within an eight hour window, or what is known in most parts of the world as regular eating. Presumably, calling it by some other name adds some element of novelty to the research.