1)
What is "Lachsos"?
1.
Rashi: It is a hiding place, shade - a small matter.
2)
Why does it say "mi'Beto'ach ba'Adam"?
1.
Rashi: Beto'ach is a healthy, strong support. Even so, a faint shelter of Hashem is better than man's strong promise of security.
2.
Radak: This is like "Arur ha'Gever Asher Yivtach ba'Adam