Can I use "as the fact that" instead of "for the fact that"?

It's so interesting that there are so many different and funny names for facial hairs in English like this one. Are there any other names for beard?

Yes, beards are considered a fashion statement on their own and there are many different styles of beards/moustaches out there! For example, handlebar moustaches (they look like the handlebar of a bike), circle beards (the chin patch is connected to the moustache), goatee beard (a small, short beard on the chin with no moustache), royale beards (like a goatee but with a moustache also) and so on.

What's he mean by "sweaty" here? Is this word commonly used to describe food?

I think the speaker wants to say that the food is moist and not dry or lacking moisture. He is probably using "sweaty" here in a humorous way. "Sweaty" is definitely not used to describe food normally (except for the technique of "sweating" food, which means to gently cook something). If it is, it usually is not meant in a positive way. However, we can see that based on the speaker's tone and facial expression, he is just making a joke here. Ex: I feel so sweaty and hot. Ex: Gently sweat the vegetables to draw out their natural flavors.

Can I use "can" instead of "could" here?

Generally when talking about possibility, which is what is happening here, while "could" and "can" have similar meanings they do have some different nuance. "Could" is usually used when there is small or weak possibility of something. While "can" is used for general facts or things that have a strong possibility. In this case, saying "a child could make them" is a little weaker and suggests that it's not very likely. Changing that with "can" would remove this nuance. Ex: It can be dangerous to cycle in the city. (Sounds like general fact) Ex: It could be dangerous to cycle in the city. (Sounds like a possibility)

Is there a difference between "sale" and "discount?" Or how about "off" like 80% off.

Yes, there is a difference! A discount is usually a small amount reduced from something. Whereas a sale is either similar to a promotion or up to a larger percentage "off" of something. A sale could also be a season-end event, season sale, or for a specific reason or occasion. Whereas a discount could be applied for many reasons and may not be season-specific. The term "off" could be used for a "sale" or "discount" as it indicates the amount in percentage that is reduced. Ex: There's a 50 percent off sale at the clothing shop across the street. Ex: They have a discount section for food that expires the next day. Ex: You get five percent off if you have a loyalty card.

Why "in" and "here" is used together? How are "What's going on in here" and "What's going on here" different?

This is a good question. In this context, both "what's going on in here" and "what's going on here" can be used to express the same general meaning. "In here" is often used to refer to a specific place, usually one that is enclosed in some way (like a room). Thus, we can interpret the speaker as meaning "what's going on in this room" with the "in here" meaning something like "in this room." Generally, you have a choice to use either, with "in here" meaning "in this specific, enclosed space," while "here" means "this location." Ex: A: Where are you? B: I'm here at work. (This location) Ex: There are so many mosquitoes in here! (This room/enclosed space) Sometimes, both can be used, like the example in this video. Ex: It's crowded in here. (Enclosed space) Ex: It's crowded here. (General place)