Hot answers tagged saludos
There's a lot of sociolinguistic issues going on between tú vs Vd. If someone is younger than you, you can generally use tú, but the details are best left to one of the questions on here more directly suited to it, but when in doubt, use Vd.. Omiting the pronoun can always (and, preferentially) be done with tú. With Vd. it is better to include since you ...
Since you are addressing someone you don't know I would use "usted", except if you are addressing to someone much younger than you or if depending on the context may seem inappropriate to be too serious or too formal. To me, #3 is the one that sounds best (along with #5). Note that #1, #2 and #5 should be ¿Disculpa (o perdona), hablas inglés? and ...
In Spanish we don't need to emphasize or clarify the subject as in English or French, the conjugation tell us clearly. So, from your 6 choices in the first 4 you can avoid to say the pronoun. Guifa explais it very well. Now, about your options: The 1 and 2 are incorrect for me, in the way that don't sound natural. Not for a native speaker. And if you want ...
It means it was no trouble, no inconvenience, it cost me nothing so you're welcome. Just a routine courtesy among equals.
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