1)
What are the ramifications of the B'ris that Yisrael entered into at Arvos Mo'av?
1.
Rashi: They accepted upon themselves the Torah with a curse and an oath over and above the B'ris that they accepted upon themselves at Har Sinai.
2.
B'rachos, 5a: The Torah writes "B'ris" in connection with Yisurim (the suffering of the Tochachah), and in connection with salt (in Vayikra, 2:13 - to teach us that, just as salt sweetens the meat, so too, do Yisurim cleanse (or sweeten) 1 a person's sins.
1
See Torah Temimah, note 55.
2)
Which respective eras do the B'risos here and in Bechukosai, cover?
1.
Ramban: Refer to Vayikra, 2:11:7:1*.