I need to purchase a new computer. I went into the apple store today and attempted to talk with a salesperson about computers, smh, too bad I wasn't buying a watch or a phone, maybe someone would have been able to answer my questions. I'm concerned about making a mistake and not getting enough memory, high enough resolution, fast enough processor, etc. I create and sell educational materials. Other than regular everyday stuff like safari, mail and calendar, I use Affinity Designer and Affinity Photo for my design work and a couple desktop publisher apps. I'm not getting an iPad because I need to manage tons of files. For the past 15 years, I've used laptops but I need a bigger screen. Would the low end 21.5'' iMac be too slow? Is a fusion drive worth it? Would it be better to just get a SSD and use an external hard drive or two since I need at least 1TB, probably need 2TB? If I start making educational videos, what should I buy for basic video editing? Thank you for helping me.