1) Landing page sites no longer pass master with Google. Instead of just a landing page, you must now build an entire site around each root keyword (or family of keywords) you've targeted.

2)  Each site will need to have 25-50 pages of good content, all focused around the same set of keywords you have targeted.

3) Your site must deliver a good experience to your visitors. 

4) Putting video on your site will make your visitors stay longer on your site – that is, will increase your site’s “stickiness” and increase your "Quality Score" with Google.

5) While this is a lot more work than it used to be, if you do this right, the upside is your site will rise rapidly in the Google’s organic search list (which is free) for the keywords you’ve targeted.