Various halachas pertaining to our fourth category "kevashim/shlokos" (preserved and cooked foods).
Is There a Problem with Using Foods That Smear When One Is Not Going to Eat Them on Shabbos?;
The Halachas of Shabbos When תִּשְׁעָה בְּאָב Falls Out on Motzi Shabbos;
Ear Plugs, Examples of Strengthening an Item on Shabbos, Hairspray, Stretching Shoes, etc.