Started with planning to develop super Mario Bros. Using python.
Ended up with a music player which can play ogg (and mp3 files with 320 kbps bitrate) .
Why!?

Whatever Google has done wrong, I am nonetheless thankful for them releasing the patentless open-source VP9 and AV1 video codecs.

The world needs modern open-source video formats and Google has filled that void.

I know, OGG Theora exists, but that is two decades old and inefficient. VP9 is the counterpart that can compete with H.265.

Make sure your software does not lose data when improperly quit, and does not allow deletion without a proper confirmation dialogue.

I have experienced pre-installed voice recorder applications that leave behind an unsalvageable corrupt file if the smartphone shuts down due to running out of battery charge, or powers off due to battery undervoltage (as a result of an aged battery).

As often, third-party software beats pre-installed software, and the voice recorder "ASR" by "NLL apps" leaves behind a playable file when unexpectedly quit. Might be because it uses the OGG vorbis format rather than M4A or 3GP audio.

Also, the camera software of the Samsung Galaxy Pocket smartphone from 2012 (which was crap anyway) would discard a video file if the recording was quit through the "back" navigation key.
Perhaps this was done deliberately, but it is a terrible idea due to the possibility of accidents happening.

Some gallery software for Android lets the user delete photos and videos by swiping vertically. After this, a so-called "toast" notification appears with an undo button. If not responded to within seconds, or when tapping next to it due to stress, the photo or video is gone. This is, needless to say, terrible design.

laravel websocket server, laravel echo plugins, android app, ionic angular frontend, laravel backend... hopefully the tech stack is stable for an ordering app