Commas before like, though, etc

In North America, etc. requires the period. Peronally, I prefer to use the English "and so on."

With regard to the comma question, it depends on the sentence. If the clause beginning with the word "like" is parenthetical, that is, not essential to meaning of the sentence, set it off with commas. If it's dependent, that is, part of the sentence, no commas are required.

Fruits, like apples, kiwis and bananas, are great sources of vitamin C.
<commas required>

I enjoy fruits like apples, kiwis and bananas.
<commas not required>

Also, there's no hard and fast rule for this, but I prefer to use a comma before the "and" when stringing together a list.

For instance, I would say that I like apples, oranges, kiwis, and bananas.

Others write it like Caro, without the comma.

Neither is more correct than the other.

Yeah. There's lots of places you can go (including in this very forum) to debate the merits (or problems) with the Oxford, aka serial, comma. I use it in my technical writing because ambiguity is NEVER okay in tech writing. I only use it in my regular writing (journalistic, fiction, and so on) if it's in the house style guide or if there's ambiguity in the sentence.