LinkedIn Learning is a good resource. While this course on InDesign Essentials is extensive, each video is designed in short segments, so you can easily jump in, get what you want, and move on. You can also play at 1.5 or 2x speed, which for most authors in these courses works well (disclosure: of which I am one, InDesign Tables, Animations, Publish Online, etc). Here is the Essentials course by David Blatner: https://www.linkedin.com/learning/indesign-2022-essential-training/indesign-learn-the-fundamentals
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