On accessing Youtube: I’ve been using FreeTube for years and it’s great, it even has support for Sponsorblock, and your subscriptions are stored offline in the app, among other benefits. For the browser, there is also the Libredirect extension, which you can use to easily redirect to Piped or Invidious instances.

If you manage to get yt-dlp to work (btw check that you have the latest version), I’ve also used the “play with MPV” Firefox extension in the past.

Not really a life hack but: folding bicycles are so, so convenient for everyday use (fits in every elevator, fits under your desk at work, fits in public transportation even when it’s crowded, etc)

I really don’t know how they are not a lot more common; you only need a mountain bike if you actually ride on mountain trails often enough. Even non-folding city bicycles are way more comfortable for everyday usage (higher handlebar position and cushiony saddle <3)