Consider the average cost-per-click in your industry. Before deciding that SEM is right for your business, research and consider how much you’ll need to spend to show in paid search results. Keywords have varying cost-per-clicks based on competition. If your cost-per-click is low, it might be the right strategy for you. On the flipside, a very high cost-per-click might make you decide you’re better off focusing on SEO.
Email Marketing: Email can be an effective way to maintain a connection between your business and its customers. You can purchase email addresses of customers and prospective customers, but the best results usually come from emails collected on your website. You can entice people to give you their emails through a quality free offer, such as a downloadable resource, called a lead magnet. Once you have their email, you can send a newsletter, special offers, and other information your target market would be interested in—as long as you follow laws and regulations around email marketing.
QUOTE: The manual actions team… can look at the labels on the on the links or a site gets. Basically, we have tons of link labels; for example, it’s a footer link, basically, that has a lot lower value than an in-content link. Then another label would be a Penguin real-time label. If they see that most of the links are Penguin real-time labelled, then they might actually take a deeper look and see what the content owner is trying to do.” Gary Illyes, Google 2016
The SEO starter guide describes much of what your SEO will do for you. Although you don't need to know this guide well yourself if you're hiring a professional to do the work for you, it is useful to be familiar with these techniques, so that you can be aware if an SEO wants to use a technique that is not recommended or, worse, strongly discouraged.