I'm asking everyone here. Can I advertise a website that contains all the links of my other websites in it? For example, I have 10 pet sites. I want to create one website where I will list and display in the homepage all of my 10 pet sites. That will be my landing page. Can I advertise that? Is it not in any way violating adwords policies?
Not at all, it's totally fine. You should ask yourself a different question - what do you want out of this advertising? What do you want your visitors to do? Click on other links or stay? Will they come back? How to make them bookmark the site or subscribe to your email list? How to make the most out of your Adwords money? Strategy is what you need, and clear paths for your visitors to follow.
If they just click away and forget about your site or you do not have any opt-in forms or something like that, you are doing something wrong. Of course I have no clue what kind of website you have, but getting clicks is just one part of the equation, optimizing your landing page is a task in itself, and just letting your visitors choose from 10 other sites is a bad idea.. Why? Because people are lazy, they click on the ad that promises them something, they want to see it (have it, buy it sometimes) right away and they want to be told what to do and where to go. Literally. :) That's when split-testing comes into play (but I would get 15-20 friends and ask them to "click the ad" and listen to what they have to say about your landing page, without thinking, right after they see your page - their first words is what you will have to listen to very carefully.. Cause that's how you should run your first test and model the user behavior before spending money on people you won't be able to ask anything or even see their faces :) Kinda long answer.. Hope this helps :)