Mandarin learning material recommendations:
My favorite Mandarin dictionaries:
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MDBG
I’m not even gonna try listing all of the features because there’s just so many and I’ve used it for many years now and on a daily basis. Not to mention it is constantly updated. In terms of features and overall quality, MDBG is the best in my opinion.
MandarinSpot’s Annotator
Sometimes has slightly different definitions compared to MDBG, and sometimes it will have the definition for words that MDBG does not have entered yet. Also, it’s helpful for anyone who reads Chinese best horizontally as opposed to listed vertically like on MDBG.
Pleco (app)
Most similar to MDBG, but for your smart phone.
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Important Note:
Please keep in mind that none of these dictionaries are perfect and language is constantly evolving, so new terms are not likely to be in any of these dictionaries. there is not many moderators for these dictionaries so sometimes definitions and words won’t be entered in for weeks or even months.
If you find yourself with some thing that is clearly a word but does not have an English definition entered into either of these dictionaries it works best to look up the definition in Chinese on Baidu Dict or Google, or even check out Wikitionary/Wikipedia. 
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