Guide · 10 min · Updated 20/05/2026
YouTube SEO 2026: the channel-level signals that matter
Why per-video optimisation is overrated and channel-level signals (watch-time, session depth, topical authority) drive growth.
Watch-time, not view-count
YouTube ranks for session watch-time. A 10-minute video with 50% retention beats a 3-minute video with 80% retention for ranking — total minutes is the metric.
Channel topical authority
YouTube's algorithm prefers channels with topical concentration. A travel channel that posts cooking videos dilutes signal. Concentrate or split.
Common questions
Do tags still matter?
Minor signal. The first 100 characters of the description, the title, and the chapter markers matter more.