Seeing a lot of drag after installing Mobile optimized theme. Any suggestions?

There are two types of situation here.

1. The kw will be "Top Perfume", where all the sub-niches such as cars, home, offices will be targeted from a single page or article.
2. The kw will be "Top Perfume for car/offices/homes", where all the kw's will be targeted through separate pages.

From SEO point of view which will be more beneficial.

I just bought a very old domain in our niche. Its almost 20 years old. And it has got some good links too. But don't know how to proceed now. Any advices??!!

Suppose there are two pages on one site which are similar and audiences often overlap with each other. Now both of them may exist but only one of them should rank in the rankings.

The things here is like "iPhone 7" and "iPhone 6". Both of them should have their own pages but the page having the latest version of iPhone will rank. In this type of situations what should I do to get my desired page ranked better?

Visit to a single page for a long time, does this mean higher bounce rate? I hope I am explaining it alright. I am new to this forum.

Can you really earn links from directory submission? Is it really possible?

As you all know I am working on my backlink analysis? Should I buy the Alexa plan? Will it be a good choice.

I have no whatsoever knowledge about .htaccess files and also don't have any experience in programming. How will you guys make the redirects in this situation of mine?

In webmaster tool I am only seeing the name of the site which is referring. How can I see the specific page which is referring?

If you were told how to effectively build trust through email marketing then how you would have described it in simple words?