A good SEO strategy will organically move you to the top of the search results. With Pay-Per-Click (PPC) ads, you’ll take matters more into your own hands by paying to land atop the searches. The best part? You only have to pay for premium placement if someone clicks on your link. You choose the keywords you want to bring up your ad, and you can set and limit your own budget.
These services can host your content on their servers free of charge, but in exchange for that zero cost, your online destination will have a less-than-elegant domain, such as jeffreylwilson.tumblr.com. That might be fine for a personal blog, but it will look too low-rent for a business that wants people to trust it enough to pay for whatever it's selling.
Be careful not to obsess too much about all the "latest advice" on marketing websites. While some of the advice is useful and sound, a lot of it is not. Marketing is not a science––it's an ongoing, ever-changing experiment. You are the best judge for how your own promotional strategies are working (or not). Listening to users and learning from their experience is the most valid approach of all.
A domain name is the bit of the URL (the long address in your browser’s search bar) that identifies a web page — in this case your website. You can register them separately at sites like GoDaddy and Namecheap, but website builders offer to do it for you when you sign up with them. Most provide it for free (at least initially), while a handful charge a few extra bucks.