Rabbi Avrohom Baruch Zachariash teaches the halachas of Chol Hamoed with the Mishnah Berurah (O.C. 538 and 539).
1:55 If everyone is having a sale during the 9 days, why can’t I?
3:49 Parshas Hamon
5:18 Meshech Chochmah says that even a non-righteous person will be supported by Hashem.
10:14 Rambam seems to say only a righteous person gets this support
13:27 Grandson wants drug money from the grandfather
17:50 Kids can still do work on Chol Hamoed to prevent a loss from their deceased father’s estate
20:14 Gentile company that uses 1/60th non-kosher ingredients
23:55 Product Placement in supermarkets
25:30 Intro to 539
27:36 Doing business on Shabbos
32:55 Soda machine in Nebraska
33:45 Buying a Laundromat
35:30 Pidyon Haben on Shabbos
38:30 Travel agency on Shabbos