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Could please tell how use 'would' and 'could' while speaking?
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Hi, this is how to use ‘could’ and ‘would’ while speaking.

The word ’could’ may be used to make suggestions or polite requests:

Could I use the phone? 

The word ’would’ may also be used to make suggestions or polite requests:

Would you mind if I used the phone? 

Could’ is like ‘can’: ‘would' is like ‘will’.

Small words but they are like building blocks that can be used in very many ways.

Comments  
One way to learn the use of the word should, could, and would, is to learn the limerick:

There once was a girl from St. Kilda
Who went out with young master builder.
He said that he should, and he could, and he would,
And he did, and he jolly near killed, her.