1) Youtube Keyword Research - When you're creating a Youtube video you must create the video with a purpose. Randomly making a Youtube video without doing any keyword research will NOT rank your video on the first page of youtube in 24 hours or less. Follow what I teach you in this video and if you would like to leverage the tool that helps you do keyword research for all your youtube videos then i've left the link above.
I have 1 little problem with your claim about longer videos being better. Personally when I’m looking for a how to solution to a problem I prefer shorter videos because then I won’t have to click through the video to get to my answer. I think eventually it will be about offering the best information in the shortest span of time. I think ultimately that the retention rate of a shorter video with the same quality will beat a longer video just because it has less retention.. because people prefer easy and fast solutions. What do you think?
But sometimes there are site-wide technical issues that get in your way of ranking on Google. Luckily, fixing technical issues is not a required step for every single piece of content you create. However, as you create more and more content you should be aware of duplicate content, broken links, or problems with crawling and indexing. These issues can set you back in search results.