Lynda.com is good. They offer a download of sample files you can play with but no actual exercises to walk you through. I assume you follow along with what the host is doing? It's not clear. Lynda does have a deal with many libraries where, if you have a library card, you can access every Lynda.com course.
The Adobe Classroom in a Book series from Adobe Press is great and can get you up and running in no time.
Also, check out SafariBooksOnline.com. This is the Netflix of technology books. It is from publishers O'Reilly and Pearson (which owns Adobe Press, Peachpit and many others). It will have everything you need not just for software but filmmaking, photography you name it. They have both eBooks and some video training all of which can be accessed mobile. A basic plan, which allows you to check out 5 books per month, is $15.
>>>Because the Canon EF lenses can't focus at infinity on a Nikon body, which renders them useless on a Nikon body. Where Nikon lenses focus perfectly on both Canon and Nikon camera bodies.
Nikon actually has a greater distance between the lens flange and the sensor thus making it impossible to mount a Canon EF lens.
>>>So Nikon lenses are more versatile...
I said the mount was more versatile. B&H currently has 800 SLR lenses and another 602 Digital Cinema lenses. Any of these can be placed on an EF mount. Any of the 359 EF mount lenses cannot be placed on a Nikon so that's at least 359 more lens options.
>>>Only if your camera is compatible with the Canon EF electronic lens mount...
True but when you factor in digital cinema cameras, you have more camera options. Nikon doesn't even play in the digital cinema space. Blackmagic and Red both offer native EF mounts but no option for a Nikon F mount.
I will give you that Nikon makes some nice lenses and manual aperture control is great. I'd love to pick up some old Nikkor glass but I'll use them on a Canon body.
I've had the 70D for a year and used it for both stills and video with no moiré at all.
From my perspective, when starting out, I think the thing you have to keep in mind is, with any camera, you're buying into a two part ecosystem: camera bodies and lenses.
As for a body, you want one that is easy to use from the start and allows you to grow into it. As your skills grow, your needs may change, but there will be something for you to move up to.
Canon and the 70D will do just that. It is feature rich and will keep challenging and enabling your creativity for quite a while.
As for lenses, it’s all about the mount. If you are so inclined, you can use Nikon lenses on a Canon EF mount with an adapter but there is no adaptor to use a Canon lens on a Nikon body. Because of this, I would suggest that the EF mount is more versatile.
In addition, should you come across some older lenses, you can probably find an adapter that will allow you to mount that lens on your camera. Should you wish to move away from Canon, there are Blackmagic, Red and other high-end cinema cameras aloe use of the EF mount. There are adapters available for other cameras (Sony, Micro 4/3). Let’s not forget that there are a number of third-party lens manufactures (Rokinon/ Samyang, Sigma, Tamron, Tokina) that make lenses with the EF mount.
To say the least, the EF mount is robust platform. Any investment you make in Canon and/or EF glass will carry you throughout your career.
All that said, if you’re looking at macro lenses, you might want to consider the EF-S 60mm. The 70D has an APS-C sensor which is smaller than a 35mm film/ full frame format sensor. In essence, this will make you’re the focal length of your lenses 1.6 times longer. The EF-S 60mm would be equivalent to a 96mm lens on a 35mm camera whereas the EF 100 would be equivalent to 160mm lens. You may want that.
Best advice, try out the lens before purchasing, if you can. Purchase from a vendor that has a generous and easy return policy (30 days or more) so you can try the lens out under the conditions where you will normally use the lens to see if it meets your needs. If it doesn’t, return it and try something else.