Can anybody discuss about increasing the quality score of a keyword in Google Adwords in more briefly?

Here are the list of things that matters and the Quality Score is calculated. The cost per click goes down this is how it work.

 

COST = bid amount +0.01  ÷ Quality Score

 

And Quality Score depends on these factors.

Past clickthrough rate (CTR) for certain keywords

How often a specific keyword led to clicks on a specific advert.

A display URL's past CTR

How often a specific display URL received clicks.

Account history

The overall CTR of all the ads and keywords for an account.

The quality of a landing page

How relevant, transparent, and easy-to-navigate a page is.

Keyword/ad relevance

How relevant a keyword is to the advert.

Keyword/search relevance

How relevant a keyword is to what a customer searches for.

Geographic performance

How successful your account has been in specific regions.

An advert's performance on a site

How effective an advert has been on this and similar sites in the Display Network

Targeted devices

How effective adverts have been on different types of devices, e.g. desktops/laptops, mobile devices, and tablets

Below are my thoughts to increase the keywords Quality Score.

Increase Keyword bid

Write Compelling Ad copies

Optimize landing page with respect to keyword to improve landing page relavancy

Increase CTR

Add call to action notes in Ad copyies

tightly segregate keywords into theme based ad groups