Keep primary controls within reachable thumb zones, especially on larger devices. Use bottom navigation, sticky progress, and large, well-spaced tap targets. Present one decision per screen. Reduce typing through buttons, chips, and autofill. These small choices add up, inviting learners to continue even while walking, commuting, or balancing coffee and phone.
Compress responsibly, stream adaptively, and offer low-bandwidth fallbacks. Replace long videos with short clips and annotated images. Preload the next step during dwell time. Provide transcripts for noisy spaces. Speed signals respect for time and conditions, making learners far more likely to complete lessons during unpredictable schedules and unreliable network connections.
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