'Garage' was a largely American phenomenon in the 1960s (presumably they had more garages per capita). It was 'amateur', guitar based and largely commercially unsuccessful though there was a lot of it, in every garage, so to speak.
It was mainly male, but there were also female groups such as the Pleasure Seekers (featuring a young Suzi Quatro) and The Debutantes, both from Detroit and two of the first all female rock bands, as opposed to 'girl groups' who sang but didn't play the instruments.
The key lesson from the digital age is don't leave the best bit of your song or film until the end. In which case the Stone Roses would have had no chance. Standing Here is far from their best song (it was a B-Side) but the outro from 3.07 turns it in to gold. Skip the first 3.06 if you wish though it ain't so bad.