being in the food & hashgacha business for over a decade already.
these are the 2 MOST COMMON chillul shabbos i have seen in frum heimeshe homes all around.
1)washing cherry tomatoes in their containers on shabbos (pure borer. the containers have holes in them….)
2)sweeping your house floor with a straw broom on shabbos (forbidden for same reason a person is not allowed to comb her hair on shabbos, cause you MIGHT pull out hair even though its unintentional its forbidden. a straw broom the peices come out versus the big school brooms-which they make in small too-the short strings on locked into the broom & don’t come out)
this always shocked me to see it hundreds of times in frum torah homes in frum communities. you don’t need to be an expert in hilchos shabbos or be a rabbi to know this. the first time i learnt Rabbi Ribiats hilchos shabbos sefer (over 1400 english pages-not artscrool 700 hebrew & 700 english) it only took me 2 weeks after finishing it to realize its time to learn it again. how do you expect to remember over 1400 pages?