This makes me think of the SNL Papyrus sketch.

Sometimes skill sets overlap. These days a graphic designer likely is fluent in creating assets for both print and digital spaces. Creating assets has nothing to do with 'web design' other than physical/digital dimensions of an object.

When possible, I export assets from Illustrator as an svg for the web and this makes sizing issues much easier to manage. A web designer is likely a 'front-end web developer' which may not have excellent graphic design skills (an eye for it, basically) but is fully fluent in being able to manipulate html/css to create the desired effects.

It would take years of working in both to be extremely competent all-around and most individuals either don't have the eye for design or are bored to death by trying to learn to code - so that is likely the reason you see people fall into one category or the other.

Graphic designers think visually first, so it's important when learning to be able to quickly see the effects of your changes. Tumblr is a good place to practice.

W3 Schools is a great resource for all the basics. https://www.w3schools.com/htmL/html_responsive.asp

Tim Ferriss made this 10-minute video on some therapy techniques he uses that may help you as well. Link > https://www.youtube.com/watch?v=BzXM3mPs6z0

Personally, I do heavy compound lifting with a few auxiliary lifts mixed in 2-3 times a week with 2-3 days rest between. This makes my life better in so many ways. I'm more relaxed, think more clearly, and crave healthier foods, and have more energy overall. I also use a foam roller and lacrosse balls to work out strained muscles, sort of a painful self-massage....but it works! Check out Kelly Starrett's book, Becoming a Supple Leopard for easy to learn and follow info.

At my desk, I try to be conscious of my body position and try to do something physically different for a few minutes every few hours.

Not bad. Just boring and generic... like it belongs on an otc medication.

I do a lot of work in Photoshop, all on a PC. It is spec'd out to handle much more intensive programs. And I have a nice screen. I happen to be asked how to do something in Ps on an iMac, low end version, and it is amazing the difference you'll see in the smoothness of the application and how much easier it is to get the effect you were going for versus on a PC.

To be honest, you won't know until you try yourself. If you can play around with one for an hour I think you'll be sold. I bought a new iMac retina for personal use and love it. I'll probably end up doing a great deal of (work) creative work at home for that reason.