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I'm using lynda.com. It is a bit pricey, but it gives you a lot of good tutorials with exercise files.
I've been involved in graphic design instruction and support and often recommend any of the Photoshop books from AGI. Some of the authors actually contributed to official Adobe and Microsoft instruction manuals; so they are definitely authorities in technology instruction.
You can use free alternatives. There is a lot of quality ones coming to the fore. I suggest unsplash.com. Of course, these such sites might not have the breadth and volume of imagery you need. These can be a brilliant alternative when you're looking for more atmospheric imagery. They are high quality and have no restrictions - you get the full, high res ...
Dreamstime offer the largest watermarked thumbnails of any of the microstock sites I have come across. http://www.dreamstime.com/
RM agencies, Getty Images for example, have "Comping File License" which is free of charge or for a minimal fee. I know only two RF agencies that provide comp images which are Dreamstime and 123rf, I'm sure there are more. Large images (with watermark) are available for registered users only.
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