Long tail keywords are the low hanging fruit of keyword research. These are phrases with low competition, and generally low search volume as well. While any individual long tail keyword might not attract a ton of organic traffic, targeting them en masse can be an easy way to quickly pick up steam in your niche and poise yourself for tackling more competitive search terms.
If you have an "Action against Site" notice - then your site drops out totally from the SERPs and you have essentially been de-indexed. There will be a notice from the manual webspam team (real person) inside Search Console messages. If this happens, you cannot do much other than fix things and then send a plea and appeal to Google literally begging them to put your site back in their index - because you have cleaned up everything you do (or your SEO company did to your site).
External duplicate content is when you copy-paste content from other websites. Usually without placing a link to the original source or using canonical attribute. Google dislikes such content for one simple reason. It doesn’t add any value to end users and the Internet in general. If you have to choose between copying articles from other sources or not having any at all, I’d suggest you choose the latter.
To use this feature, click on the second tab that you will find on the top right bar. Type in the keywords that you want to view the performance of, and also type in the name of your domain. Hit the search button and allow the software to find whatever you are looking for. Site rank will analyze the top page of Yahoo, Google, and Bing to find where your site could be. Jaaxy will also show you how your post or page is performing, so you will know if it is climbing or dropping in the search.