What is always in front of you but can’t be seen?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Different lights make me strange by changing me into different sizes. What am I?

What can go up a chimney down, but can’t go down a chimney up?

10+10 and 11+11 can give you the same answer.

Explain how?