Use "much" to describe a relative amount of a noun that can't be easily counted or quantified. If you can't put a number before the noun, use "much."
Also, if you replace the object with a pronoun, it should be singular (it). Consider "collective nouns" that are singular but describe an unquantifiable volume.
"Much" is often combined with a modifier like "too," "not," or "very."
There is not much snow on the ski slopes this year. It's a small amount.
There's much work ahead before the end of the project. It's a big one!
There's too much sand on the beach to count it all. It's everywhere!
"Many" describes a quantifiable, countable noun. If you can put a number before the noun you should probably use "many." Here if you replace the object with a pronoun, it will be plural (them, they).
Many ski-lift operators will be looking for jobs. Who will employ 30 of them?
This project has many complex parts to consider. They are all critical - all 1000 parts.
There are too many grains of sand on the beach to count them all. At least a million of them are in my left shoe.
Using "a lot of" or "lots of" is sort of personal preference. In most cases the 2 are interchangeable.
There is a lot of ice on the road, so drive carefully! Also, there's lots of snow!
We still have a lot of work to do - lots of separate tasks to complete.
I found a lot of sand in my right shoe, and lots more in places I didn't know existed.
A lot of people make the mistake of writing "alot," so don't do that!
In most cases either one works fine, but you should be careful about replacing "a lot" or "lots" with "many" or "much." Note that in the examples below "many" works in place of "lots/a lot", but "much" doesn't work at all.
At first there was just one monkey, but then the banana truck exploded and there were lots of monkeys running all over the place!
A lot of the monkeys ran off to the beach afterward. Lots of bananas still litter the road though.
The town will need to hire a lot of people to clean them up. Lots of people need jobs now anyway.
The use of elder is restricted to compare human beings, mostly in family relationships. The one who is elder is the one who was born first.
This is my elder sister Betty.
You cannot substitute elder for older at all times.
Elder can only be used for people, when used for things, it is meant as a special figure of speech involving personification, so to be used with extreme care.
You cannot use elder with "than" (even if it is implied, as in sentence b) ):
a) This is my sister Betty, she's older than me. (and not elder)
b) This is my sister Betty, she's older. (and not elder)
But:
- This is my sister Betty she's the elder of us two.
We do not use elder after get or grow:
- You'll understand when you get/grow older.
The restrictions in the use of the superlative eldest are the same. It is not used for things.
- The eldest/oldest of my six children has already left school.
- My eldest/oldest son is in the fifth grade.
But:
He's the oldest in the school.
Elder and eldest are considered formal and some people do not use them at all.
Best Answer
By using "lots of friends" you just intensify the expression "a lot of friends". Someone can say "I have many friends" and he could intensify this by saying "I have many, many friends". But both expressions are used so often that they are almost interchangeable and the intensifying force of "lots of" has become weak.