What does this of mean?

A lot of is a fixed phrase collocation, of has no special meaning
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RELATED INFORMATIONS

1. I want two loaf of bread
2. Would you like some tea or some water?－＿I'like juice.
3. Rice tea water milk bread egg juice restaurants eat fish apple cake banana
4. What do you perfer to_____ ,a cup of tea or juice?____ I'm used to having some water at this A.want,Either B.order,Neither C.chooes,None D.book,Either
5. Which are uncountable in shop, bread, sock, chocolate, slice, cheese, justice, water, bottle and tea?
6. A cup oftea, a glass of milk and he is The first answer is the best
7. Phrases and usages related to A.of
8. a. What are the phrases of? If you give the answer, I'll give you a score
9. This is a glass of water She has a soccer ball
10. Is this a glass of milk right? I heard it from the tape, so I don't know if there is an "a" This is a glass of milk Or this is glass of milk
11. What is a loaf of bread like? What about a slice of bread?
12. There is a box of milk on the table?
13. I'd like a carton of milk. Ask to change into general questions, to quickly
14. Is it a carton of milk or a bottle of milk? Why am I writing a bottle of milk wrong? milk
15. Which is right, a carton of milk or a box of milk? In a multiple-choice question, there is such a question: I always have ____ ,an egg,two pieces of bread for my breakfast. A.a milk B.a carton of milk C.two packet of milk D.a box of milk B. Some are d. which is right? What is the reason? (only one answer)
16. Do loaf and bread mean bread? Why can they be used together? Some use a piece of bread, some use a loaf of bread
17. The usage of piece or a piece of When an adjective modifies piece or a piece of, where is the position of the adjective? For example, translation: a piece of good news or a piece of good news I looked it up in the Oxford Dictionary, for example, a large piece of land. An interesting piece of research. But I'm still not sure where the adjectives are. Hope that high-level experts can have a detailed answer with examples.
18. A piece of cheese is a piece of cheese, so is a loaf of cheese also a piece of cheese? Is there any difference between piece and loaf? So why is a piece of bread a loaf of bread? And bar
19. What's the difference between a piece of and a bar of? A bar of soap is a piece of cheese. Why use piece and bar separately?
20. What's the difference between piece; loaf; bar? The more specific the better, always confused. I know the meaning, but what is the specific distinction The one below, I know what it means. I can find these everywhere. Will I come here to ask? The main reason is that they can't be distinguished. In English, they are different! What I want is a clearer distinction. I already know what you said. I understand the meaning, but both piece and bar can be used to express block