what w3 total cache does do actually ?

Hello,

What you need to do is to configure the plugin accordingly and tweak the settings to get the desired results.
The optimal W3 Total Cache configuration takes into account a number of factors: your theme, your plugins, the technologies available on the server. Since everyone’s site and traffic and theme is different, there is no single solution for every website.
It’s also depending on what Page speed tool you are using to check the performance of your website. Gtmetrix, GPSI, and Pingdom will give you different results.
Gtmetrix is providing most details for example:
Tested your website on Gtmetrix: https://gtmetrix.com/reports/egtours.com/OIe0lNXp
as you can see your score for “Specify a cache validator” is E (50). That means that you need to enable ETag in Performance>Browser Cache. Also, when you further explore “Specify a cache validator”, you will see that you have a lot of 3rd party resources which no plugin can handle.
Gtmetrix, as well as the GPSI, also suggest that you need to eliminate render-blocking resources. Part of that question is answered in the other topic you opened: https://www.ads-software.com/support/topic/pages-blank-and-google-page-speed-not-showing/
As stated in that post, manual minify, and eliminating render blocking resources can be achieved but it can take a lot of time due to the amount of JS and CSS files that must be added to minify in proper order.

DO i need changes in this file too ?

.htaccess

Hello,

W3 Total Cache writes its rules to .htaccess depending on the settings you enabled. That being said, you need to ensure that you have sufficient write permission for your .htaccess
I.E.
# BEGIN W3TC Page Cache core
# BEGIN W3TC Browser Cache

Hello,

I m trying to minify css and js files one by one manually. progress looks good but still testimonial section is break and both side has white space. I could not figure out which of css is effecting it ?

Hello,
If you are using any kind of plugin for the testimonial section i.e. rev. slider, you should also remove it’s JS file from minifying if added.

what does do js/css management section, when we list the js or css files ?

Hello,

Depending on the settings you’ve chosen, it minifies/combines manually listed files.

Hello,

I do not know why this files are created automatically ? When I list this kind of file in css management section, after refreshing, new file creates ?
wp-content/cache/minify/f3df2.default.include.791904.css

Hello,
That file is a cached file. Everything with wp-content/cache should not be added to manual minify.

Performance result is different with different tools like
google page speed- has score of 38 for mobile and 69 % in desktop and gtmetrix. showing up
88% and 78 %
has no render blocking issues instead has Defer parsing of JavaScript and Specify a cache validator

But google page speed checker shows render blocking issues, remove unused css, and server response time etc.

So, how can we fix above to get better result in both tools. Also, once there are few css and js file lefts which makes render blocking. If I list those file in miniy or management section, pages break. How to avoid it ?