Different uses for に?

[fatum]

I understand that に signifies direction and location. However, there's one phrase that I don't really understand:

このサイトについて

Intended translation being:
"About this site."

Why is the に particle used in this situation?

I've memorized the phrase as I understand all of the words that make up the phrase. I've noticed the に particle used in this situation with other locations as well, for example: Googleについて.

[Lonthego]

Sometimes it helps to analyze the contexts in which a particular particle is used to ascertain its meaning, other times it's just better to memorize a phrase outright, such as について = "about"
If you ignore the English translation, in literal Japanese something somethingにつく means to attach to something or adhere to something, so strictly speaking the に used here is the　に equivalent to "to" though I don't recommend memorizing it that literally.

[masaegu]

Originally Posted by Lonthego

in literal Japanese something somethingにつく means to attach to something or adhere to something

You are thinking of 「付く」 when one should be thinking of 「就く」.

つ・く【就く】 の意味とは - Yahoo!辞書

[blutorange]

But for making sense of everything, it helps to consider that:

つ・く【就く】
［動カ五（四）］《「付く」と同語源》

(Yahoo Dictionary)