Super Simple Oscillator Build - Help with audio out, power and earthing

Welcome to the forum

yes connect all the GND points to the - of the battery

if your panel is conductive, yes you need to Ground it too

the signal wire to the Tip of the jack and the jack Sleeve to GND.

There’s also a lot of thread about the SSO (you can search with the engine search of the forum)
This one maybe can interrest you

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