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Qualcuno può aiutarmi con una spiegazione della funzione di questo circuito. Translated; Can anyone help me with an explanation of the function of this circuit I can't find any article on the web

Hello! A little about me , i haven't formally studied electronics, i do not own or have access to an oscilloscope. I have been researching about MOSFETs to use an IRLZ44N as a switch in a basic boost converter, on the IRLZ44N datasheet Vgs(th) = 1v to 2v, as i undertand this Vgs(th) is the V...