Here is a list of the most useful videos on youtube marketing for 2018. I believe that they will be useful in 2019 and everyone can benefit from them! Enjoy :
How to Get More Views on YouTube (Works GREAT In 2019) by Brian Dean
How I Got 100,000 Subscribers in Less Than a Year by Neil Patel
YouTube SEO: 9 Actionable Tips for Ranking Videos by Brian Dean
A YouTube SEO Secret No One Is Sharing ... by Ruan Marinho
YouTube SEO: Top Factors to Invest In - Whiteboard Friday by Rand Fishkin
Wish you a great 2019 year and hope you also find those videos helpful for your brand and marketing efforts !