Would you like to help me please?

Hi! I don't know how to use these words below. Could you help me please?

1) What does “backpacking”mean in this sentence: “ One of my oddest job may be was when I was backpacking through Europe after University”

2) Is “as well” similar to “too” in using? For ex:
_ She is beautiful and she is intelligent as well/too.
Which word is acceptable?

3) Is “blah blah blah..” similar to “etc…”?

4) What are the differents between “gotta”, “wanna” and “gonna” and their usage?

5) What does “old-school restaurant” mean?

6) After you explain or support them more information about Something, the people who ask will say "I've got that". What does the he/she mean?

Thank you very much!

1. Backpack (verb) — to travel with a backpack.
2. I'd suggest "also". But yes, "too" has a meaning similar to "as well".
3. No.
4. Gotta — have to; wanna — want to; etc.
5. See "old-school" and "old school", adjectives.
6. "I got it" is more usual.

See: http://www.thefreedictionary.com before asking about the meanings of single words.

>> After you explain or support them more information about Something, the people who ask will say "I've got that". What does the he/she mean? <<

I got it. = I understand that.