Rabbi Avrohom Baruch Zachariash teaches the halachas of Chol Hamoed with the Mishnah Berurah (O.C. 537).
0:53 Flattening ground.
6:13 Cutting a branch – sometimes prohibited and sometimes permitted.
10:10 Chasid Shoteh – not saving a drowning woman; saving a person while catching a fish
26:05 Can girls on the bus sing while the male bus driver drives?
32:05 Trying to mekareiv an attractive woman.
34:02 Changing your mind to donate to a neighbor instead of a person in front of you.
37:16 Putting oil on a tree to save it.