Yes, you can integrate a WordPress blog into an SBI site. It takes a little figuring out, but you can do it. I did it and that's how I discovered WordPress.
Other than the vast amount of information SBI offers, I'm also constantly impressed with the search engine rankings of SBI sites. I know what they look like; they are easy to spot. In many niches, SBI sites rank well. SBI teaches you about SEO - both onsite and offsite. They also teach about building backlinks.
The info from SBI is solid, but you can learn much of it elsewhere such as Lynn's blog of which I'm a regular reader.
I respectfully partly disagree with Bookkeeper-For-You's suggestion that design isn't terribly important. The part I agree with is don't agonize endlessly over design. Choose a design and go with it - don't spend days and weeks tweaking design.
But, in my view, if SBI has not added new designs in the last year to 18 months, then I can say that I don't like their designs at all. Sure, website design is not the be all and end all, but having a contemporary looking website is important in my view. SBI designs are outdated and I believe this affects conversion to some extent. WordPress themes and Joomla templates are far more up-to-date.
That said, content is the most important element of a website. SBI repeatedly teaches this.
So, if you're prepared to write great content and do backlinking (tedious, but necessary), then you're in a position to create a successful website.
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