Explain assembler?

Question

assembler

Please help me explain verbatim what the "MOV DL, DS:[BP]" command will do
And please explain the equalities:
SEG (X + 10) = SEG X
OFFSET(X + 10) = OFFSET X + 10
TYPE (X + 10) = TYPE X

Answer 1

> MOV DL, DS:[BP]
The command doesn't look very good, because the BP register is usually used to work with the stack. But ok.
Actually take the value from the date segment, at the BP offset and put it in the DL register.

Answer 2

Newbies don't understand. It seems to me that the study of this piece of code should begin with preconditions.
From context. Say something was ALREADY in memory and we continue the calculations.