How does a tax extention work?

i live in california. the only job i had in 2018 was working for Door Dash food delivery. i made about 15k. i never paid quarterly taxes, and i never even filed taxes but in April i did request an extention and ithink it said i have until october. i bought a hybrid car last year so i should probably quallify for... show more i live in california. the only job i had in 2018 was working for Door Dash food delivery. i made about 15k.
i never paid quarterly taxes, and i never even filed taxes but in April i did request an extention and ithink it said i have until october.

i bought a hybrid car last year so i should probably quallify for ev tax credit anways.

just curious how the extention process works?

also i never paid quuartely taxes for the first half of 2019 door dash earning even though i quit in April.
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