Hello,
This is my first time building a raised vegetable garden and have
quite a few questions.
The garden is going to be a foot deep underground and a foot above
ground.
The dimentions are going to be 8'x4'.
I'm going to use 2"x12" redwood lumber. It's not treated.

First, and I've heard yes and no to this question, should I treat the
redwood lumber that I am going to build the planter out of? If so,
with what?

Second, what kind of "L" brackets and screws will last the longest?
Should I use galvinized screws and brackets? if not what?

All suggestions will be appreciated.