LPT it’s worth the effort to learn how to whistle loudly using your fingers (or not).
I went for long walks and taught myself how to whistle loudly. Put two fingers (thumb, plus pointer or middle) in your mouth, on your bottom lip, then put the underside of the tip of your tongue against your fingers… then blow. Try again. Try again. Eventually you will be able to whistle very loudly. Very useful for silencing a crowded room, getting someone’s attention from far away, and generally impressing people with a basic skill. Good luck!