Rabbi Avrohom Baruch Zachariash teaches the halachas of Chol Hamoed with the Mishnah Berurah (O.C. 537). Watering grass; stains on table cloths; Oneg Shabbos (and wearing makeup) versus going to the mikveh; Having a Gentile turn off a device to save money; Being lenient about Kashrus due to guests or oneg Shabbos; investing in an internet loan brokerage; plus lots more!