So/ such

So

we use before an adjective

This flowers are so beautiful
The car is so red

So

so many and so few - countable nouns

There are so many cars
There are so few days off left.

So

so much and so little - uncountable nouns

There is so much water in the bottle
There is so little time to do the homework

Such

such a / an - before adjective and singular countable nouns

We have such a serious problem
He has such an incredible habit.

Such

such- before adjective -plural countable nouns

They sell such nice products here!
We’ve had such interesting discussions

Such

such - before adjective-uncountable nouns

My friends gave me such good advice.
If you ever need a painter, Joe does such nice work.