Hi expert !! How to remove cashing problem of website?

We will be using many customized application and widgets in our site. So, the developer of the apps are pressing us that we the manager of the site should use Drupal instead of Joomla.

Now from what I have heard that Drupal are very hard to manage and frankly I have no such work experience with Drupal. I have always preferred Joomla. In which I am comfortable working with any application. What should I do?

I have a mobile site whose bounce rate goes around 50% in general. But I changed the theme of it I am seeing the navigation is difficult and my bounce rate is increasing. What should I do?

Which is the best tools to track website traffic.........?

Does Affiliate Banners get Blocked by Adblocker? Someone just said it to me does it really happen?

Is Paid traffic bad for SEO? I mean if the traffic is not that much targeted and gets a less conversion then conventional PPC campaigners such as Adwords.

Keyword CTR, how to determine it for any keyword?

Does all the no-follow links doesn't gets counted as backlinks? Do Google even consider them as backlinks?

What are the possible ways for acquiring links in 2017?

There are plenty of ways we have tried till now such as guest posting, broken link building etc. But how acquire links without any hassle?

Is there any ratio that defines links towards the homepage to links towards the inner pages? I heard some marketers say that too many links top the homepage doesn't seem to be natural so its unsafe. Will somebody clarify it for me?