Mobile advertising is growing rapidly for several reasons. There are more mobile devices in the field, connectivity speeds have improved (which, among other things, allows for richer media ads to be served quickly), screen resolutions have advanced, mobile publishers are becoming more sophisticated about incorporating ads, and consumers are using mobile devices more extensively.[24]:14 The Interactive Advertising Bureau predicts continued growth in mobile advertising with the adoption of location-based targeting and other technological features not available or relevant on personal computers.[24]:14 In July 2014 Facebook reported advertising revenue for the June 2014 quarter of $2.68 billion, an increase of 67 percent over the second quarter of 2013. Of that, mobile advertising revenue accounted for around 62 percent, an increase of 41 percent on the previous year.
Let’s say you have a promotions page where you’re promoting a product via affiliate links. If you currently get 5,000 visits/month at a 2% conversion rate, you have 100 referrals. To get to 200 referrals, you can either focus on getting 5,000 more visitors, or simply increasing the conversion rate to 4%. Which sounds easier? Instead of spending months building domain authority with blogging and guest posts to get more organic traffic, you just have to increase the conversion rate by 2%. This can include landing page optimization, testing your calls-to-action, and having a conversion rate optimization strategy in place. By testing and optimizing your site, you’ll get far better results with much less effort. 
I often see “competitors” attempt to enter the same niche industries as I am in, only to see their sites abandoned after 6 months. Well, when you’re going up against people who actually LOVE what they do such as myself, you’ll never win. I don’t claim to have the most popular sites and blogs in the world, but my most successful sites are those I am the most passionate about.
Online advertisers can collect data on their ads' effectiveness, such as the size of the potential audience or actual audience response,[19]:119 how a visitor reached their advertisement, whether the advertisement resulted in a sale, and whether an ad actually loaded within a visitor's view.[59][60]:59 This helps online advertisers improve their ad campaigns over time.
Over the last 20 years, I have seen lots of training courses. I agree with most of your experts. Site Build It was the first good training course I took shortly after Ken Envoy launched it. I have gone the Affiliorama route and thought it was a good program for beginners. At the time I took the course, there weren’t many options for niches. I have heard good things about Chris Farrell’s program but personally have not taken it. Wealthy Affiliate is by far the best program. Members learn to build an online business regardless of the niche(s) they select. Wealthy Affiliate also has a very strong support system in place. The active community of members means people can get their questions answered quickly.
Affiliate Disclaimer – if you sign up for SiteGround using my affiliate link I will donate a good chunk at no expense to you. This year I donated $3,000 to feed the homeless in Denver. In 2017, I donated $3,000 to American Red Cross at Hurricane Harvey. Your support helps and I genuinely appreciate it. I try to make my reviews unbiased and backed by evidence in the form of Facebook polls, tweets, and real conversations. If you don’t want to use it, here’s a non-affiliate link to SiteGround. Either way I truly believe they’re the best host and that your site will run faster/smoother… do your research on Google and Facebook groups and you’ll find most people say the same.
On the other hand: the main reason of bankruptcy for small businesses is bad financial management. Simply said: to forget to make invoices, not checking the payments and not following bad payers. 1 out of 3 is going bankrupt for this reason alone. I had to learn it myself. I spend at least 10% of my time with financial stuff. I don’t love it but the bills get payed ;-)
According to the U.S. Commerce Department, consumers spent $453.46 billion on the web for retail purchases in 2017, a 16.0% increase compared with $390.99 billion in 2016. That’s the highest growth rate since 2011, when online sales grew 17.5% over 2010. Forrester predicts that online sales will account for 17% of all US retail sales by 2022. And digital advertising is also growing strongly; According to Strategy Analytics, in 2017 digital advertising was up 12%, accounting for approximately 38% of overall spending on advertising, or $207.44 billion.
Digital marketing methods such as search engine optimization (SEO), search engine marketing (SEM), content marketing, influencer marketing, content automation, campaign marketing, data-driven marketing,[6] e-commerce marketing, social media marketing, social media optimization, e-mail direct marketing, display advertising, e–books, and optical disks and games are becoming more common in our advancing technology. In fact, digital marketing now extends to non-Internet channels that provide digital media, such as mobile phones (SMS and MMS), callback, and on-hold mobile ring tones.[7] In essence, this extension to non-Internet channels helps to differentiate digital marketing from online marketing, another catch-all term for the marketing methods mentioned above, which strictly occur online.