Question

To my teacher and master, the great Rabbi, may he live long and well, greetings,
a0
a0
I have several comments on various matters, and I would be glad to receive a response.
I ask forgiveness for the trouble, but it is Torah, and I need to learn, and my understanding is limited.
a0
A) Passover Tractate 113: "Be careful with your wife because of her first son-in-law," etc.
And see Rashi on Kiddushin 12a, and see Rashbam on Bava Batra 98b, that the same applies to other sons-in-law, but regarding the first one one must be more careful.
And it requires examination: what is the difference between the first and the second?

0
B) Bava Batra 91b: Rabbi Yohanan said, etc.: "A boy and a girl would stroll in the marketplace, already sixteen and already seventeen, and they did not sin," etc.
And this is seemingly difficult, for this involves a lack of modesty, and even though we saw that they did not sin, in the end there is no guardian against sexual immorality, and we do not find permission even among the righteous for gazing and mingling, etc.

0
C) Makkot 2a: "He receives the forty lashes."
And Rashi wrote there, in that context: "He absorbs the forty."
And this is seemingly difficult: what does he mean by this? It requires clarification.
And in truth it needs examination what exactly is meant by "absorbs," and why sometimes the text teaches "absorbs" and sometimes "receives lashes"; what is the difference between them?

0
Signed with great respect,