It's a slow-moving forum, and some of the recommended equipment or techniques might not be so useful to new eyes anymore.
Several times I've found myself on a walk in a nice park or recreation area with nothing but my smartphone, say on a lunch break, and happen upon a stream with a few fishes darting around. And since they move quickly, snapping one photo can be tricky. So I've often found myself struggling to take videos of found fish.
There has to be a better way than "Turn phone upside-down, dip cameras into stream" to get decent photos or videos of fish at the spur of the moment. Not everyone is a full-fledged photographer, and even fewer keep a nice camera rig in their glovebox at all times. Any tips, tricks, favorite bits of portable gear to keep handy? I know boroscopes/endoscopes have exploded in recent years as bona fide smartphone peripherals, it occurred to me that something like that could be nearly ideal (assuming the picture is decent).