Halacha from the Heart

I read that one should not throw directly into the garbage mitzva-related objects. Should I wrap in plastic the leftover shell and wax residue from “tea light” Shabbat candles?

At Ma’ariv, a boy under bar mitzvah recited Kaddish Yatom. When he finished, people told him to say Barchu as well. Was that proper? If not, should I have answered?

I will soon see my son-in-law after a more than two year Corona-forced separation. We have been in frequent contact and have seen each other often on Zoom. Should I say the beracha, “… mechayei hameitim”?

I sometimes get confused in the Kiddush of Yom Tov that falls on Shabbat. What does one do if he did not say all of the correct elements?

What if one's parents tell him not to live in Judea/Samaria? Is living there considered an extra important mitzvah, and therefore he should ignore his parents, or is it only a "beautification" of the existing mitzvah of living in the Land of Israel?

I have heard that it is a problem if part of a matza is folded over (matza kefula). How much of a problem is this, and what do I do about it?