Text: more on that soon, i'll start with a bit of background first.

Correct capitalization: More on that soon, I'll start with a bit of background first.

Text: on the coast we find their large rubbish dumps of piled-up oyster shells and other household waste, the so-called "kitchen middens".

Correct capitalization: On the coast we find their large rubbish dumps of piled-up oyster shells and other household waste, the so-called "kitchen middens".

Text: building the second garage

Correct capitalization: Building the second garage

Text: 12. screw for extractor

Correct capitalization:
12. Screw for extractor