Reddit reviews Design Dimensioning and Tolerancing
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Used Book in Good Condition
The ultimate authority for GD&T is ASME Y14.5, so you should at least have it on hand for reference, but there are plenty of books / pocket guides on the topic that are easier to understand.
Pocket Guide to Geometrics
Design Dimensioning and Tolerancing
edit: Also Y14.100 for general drawing format & practices.