Search:

Improve your website's user experience
Optimized SEO
BACKLINKS
Optimized images
Headers
Optimized for local search
Optimized for voice search

"The 500 Internal Server Error is a very general HTTP status code that means something has gone wrong on the web site's server but the server could not be more specific on what the exact problem is."

1) HTTPS
2) Content
3) Your website speed
4) Optimization for mobile
5) SEO
6) Domain age, length, keywords

Search your website with "site:" - site:example.com. Then you will see which pages are indexed and which ones aren't. You can try using these tips to index your site: https://webris.org/google-index/

Main purpose of it is to adjust to different size of devices. So in other world, on the PC you should see one design and on the mobile phone other

Amount of visitors your website gets visited in a month.

* Upgrade your hosting plan, maybe you just use all the provide data.
* Maybe you have installed too many plugins and it slows down your website.
* Optimize your website by using appropriate...

Yeah but how to properly use these free SEO tools to work? You should hire someone? Because it doesn't work for me so well...

According to bitcatcha, the best hosting services in India are these:

Hostinger
SiteGround
A2 Hosting
Inmotion Hosting
GoDaddy India
Bluehost
BigRock

I thought I knew quite a lot in this field but never heard about exchange
Interesting to read on it

w3schools has some good examples:
https://www.w3schools.com/php/php_arrays_sort.asp