Colloquially, you always say ve.
But if you want to understand newscasters for example, sometimes “and” is “u” if the noun starts with ב מ פ or a shwa.
Sometimes “and” is “vi” with words starting with a yod. “And children” is “viladim”. That comes up later in this course.
There are more rules, so google “how to say ‘and’ in Hebrew if you’re really interested.
Takeaway point: don’t be surprised to hear either ve or vi or u for “and”.
Yes verlee, and you pronounce it smekha.
Pealim is a very good site for looking up words because if you look up one like שמחה, you’ll also find the masculine singular, masculine plural, and feminine plural. If you look up one verb form, you can see all of the conjugations. It’s very helpful!