I just wanted to query your assumption that content within dropdowns etc. will be devalued within the mobile-first index. This has been asked numerous times to both John and Gary and they have both always stated that content within accordions etc. will be given full value within the mobile first index as it is an acceptable way of improving UX on a mobile device.

Loved the bit on the Youtube optimization and how to get the words to catch people and keep them engaged. My average time on my site at the moment is 1min 19 seconds 🙁 So dwell time is going to be my goal so that I can increase my DA from 16 🙂 goal is 25 so I have a long way to go — but hoping it will come. Podcasts is an interesting thought – have never thought about doing one.
And finally, the other really important bucket is authority. Google wants to show sites that are popular. If they can show the most popular t-shirt seller to people looking to buy t-shirts online, that’s the site they want to show. So you have to convince Google - send them signals that your site is the most popular site for the kind of t-shirts that you sell. Fill this bucket by building a fan base. Build a social network, get people to link to you, get people to share your t-shirt pages on their social network saying ‘I want this!’, get people to comment, leave testimonials, show pictures of themselves wearing the product or using the product, Create a fan-base and then rally them to link to you and talk about you. That’s how you prove to Google that you are trustworthy and authoritative.
Though a long break is never suggested, there are times that money can be shifted and put towards other resources for a short time. A good example would be an online retailer. In the couple of weeks leading up to the Christmas holidays, you are unlikely to get more organic placement than you already have. Besides, the window of opportunity for shipping gifts to arrive before Christmas is ending, and you are heading into a slow season. 0 to 1.2 MILLION Organic Pageviews - Ryan Stewart Keynote - OMG Live 2016
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To do this, I often align the launch of my content with a couple of guest posts on relevant websites to drive a load of relevant traffic to it, as well as some relevant links. This has a knock-on effect toward the organic amplification of the content and means that you at least have something to show for the content (in terms of ROI) if it doesn't do as well as you expect organically.

Google recommends that all websites use https:// when possible. The hostname is where your website is hosted, commonly using the same domain name that you'd use for email. Google differentiates between the "www" and "non-www" version (for example, "www.example.com" or just "example.com"). When adding your website to Search Console, we recommend adding both http:// and https:// versions, as well as the "www" and "non-www" versions.
I’ve always been a believer that hard work gets the best results, and in practice it always ends up being true. On the web it’s no different. If you want more organic traffic, you have to work for it. That means giving your best effort every time, going after opportunities your competitors have missed, being consistent, guest blogging strategically, and staying on Google’s good side.
Obviously that doesn’t make any sense, as no tool developer would have the capabilities to deliver actual LSI keyword research. Something like LSI optimization does not exist. Even Google using LSI in it’s algorithm is pure speculation. Anyone who makes such claims should take a long hard look at the LSI tutorial by Dr. E Garcia (and then stop making those claims, obviously). This is the only part I can find: http://www.360doc.com/content/13/1124/04/9482_331692838.shtml
Keep resources crawlable. Blocking page resources can give Google an incomplete picture of your website. This often happens when your robots.txt file is blocking access to some or all of your page resources. If Googlebot doesn't have access to a page's resources, such as CSS, JavaScript, or images, we may not detect that it's built to display and work well on a mobile browser. In other words, we may not detect that the page is "mobile-friendly," and therefore not properly serve it to mobile searchers. SEO Checklist 2018: 32 Tips to MASSIVELY Increase Organic Traffic