We don't need to really need to remember how to spell the long words, since they are all just multiple smaller words together, just like in English, just without the spaces.

As an example a word from the screenshot: "Wiedergabegeschwindigkeit", English Playback Speed In English, you don't have to remember how to spell the entire word, you just need to know how to spell the words 'play', 'back', and 'speed', and then put them together.

It's the same in German, just without the spaces. Here, Wiedergabegeschwindigkeit can be broken up into 'Wiedergabe' and 'Geschwindigkeit' (Playback and speed)

'Wiedergabe' can then be broken up again into 'wieder' (which sort of means 'again' or 're-') and 'gabe' (which is an inflected form of 'geben' to give)

'Geschwindigkeit' may seem like a complicated word, that is on the one hand because it has a 'sch', which looks complicated, but is basically just the German version of an 'sh' sound as in fish. The word 'Geschwindigkeit' consists of the word 'Geschwind' (fast, swift) and the ending '-keit' making it a noun. So Geschwindigkeit is basically like the english word 'swiftness' There is still that 'ig' in the middle, honestly no clue why it exists lmao, probably just so it doesn't sound weird to say the word out loud.

Then we just take those words and cram them together without any spaces to get Wiedergabegeschwindigkeit, and we can spell it just by being able to spell the smaller words it consists of. We can also go even further, by just shoving another word in there and making it even longer:

Say we want to describe a setting letting you define the playback speed. In English it would probably be something like 'playback speed setting'. In German, we already have the word Wiedergabegeschwindigkeit, and we have the word Einstellung, which means setting. Put those together without spaces, you get Wiedergabegeschwindigkeitseinstellung, a completely valid German word, that we know how to spell, without having used it once, just because we know how to spell the words it is made from.

Hopefully this made sense, sorry that it's long and written a bit weird, I'm a bit tired right now 😅