This is definitely a great investment to get when you can afford to pay for it. If not, get the Dotcom Secrets and Expert Secrets book for a starter as those cover quite a few things that is inside Funnel Hacks as well, and it is at a much lower cost as well. You’ll definitely learn a lot from those books combined with what you learn in Wealthy Affiliate.
Full disclosure: IMPACT is a HubSpot partner -- but that's not why they're included here. IMPACT's landing pages have long been a source of design inspiration. I love the simple layout of the page, from the large headline copy and detailed featured image, to the outline that surrounds the form, to the colors and fonts that are very pleasing to the eye.
Open-ended experimentation. This approach is similar to closed-ended experimentation except that more variations will be added for testing and experimentation will not stop when a winner is found. This method is used by large corporation to dynamically improve their conversion rates and improve user experience. Landing page can also be adjusted dynamically as the experiment results change to further enhance user experience.