After reading here what's a landing page is and some other articles i understood there are 2 types of landing pages, the Ad ones for commercial and the SEO ones.AD (COMMERCIAL) LANDING PAGESIn my understanding the Commercial/Ad landing page is created mainly to have a commercial Ad (like AdWords on Google) to link directly to such landing page. This landing pages are supposed to be in some way tailored to the text of the Google Ad and designed in order to trigger user action.An example could be a website that sells gold, silver and copper medals. A Google Ad that says: Buy silver medal and links to landing page that shows more specifically the silver medals (rather than all medals) and maybe some promotional offer with a big Buy Now button.The advantages of creating this type of landing page is that a user who was interested in the Buy silver medal advertisement and clicked on it, was probably more willing to buy something if he LANDS on a page talking specifically about silver medals, rather than landing on the website HOME PAGE that shows up all sort of medals and NOT specifically the silver ones.SEO LANDING PAGESStill in my understanding, on the other side, the SEO landing pages are supposed to be in very simple terms pages with some sort of interesting contents (that maybe also insists on some key phrases) in order to bring attention and reputation from the WWW to that page and indirectly to your website.Reputation and interest to the SEO landing page is mainly generated because many people are gonna link to that page or talk about it in forums, blogs,twitter, etcMy questions are:Did I understood the differences between the two type of landing pages?Are Ad (Commercial) landing pages supposed to have an inbound link from the website they promote? I would say no cause there is no reason to give any sort of reputation to these type of pages, and we would also lose the ability to see how many visitors arrived on my website from the landing page (in other words how many visitors arrived on my website from the Ad campaigns). I would not even make Ad landing pages being indexed by search engines, in this way by counting the visits to the landing page I have a better approximation of the results of my Ad campaign.
Landing pages explained more, and Ad landing pages need inlink from the webiste they promote?
seo;advertising;links;landing page
I think you understand the difference very well.In general it is better to get sales than to make things so clean.  What I mean by that is that you might not want to link from your main site to the landing page so PageRank flows to it but I would see no reason not to let the search engines crawl your landing page.  Any extra traffic is a good thing.  If the concern is tracking how much money you ad campaign is making, remember it is always easy enough to add tracking to your landing page through Google that will allow you to see what percentage of people are buying from the ads and what percentage are just coming straight from SERP.