While taking the Stepik TON Blockchain Course, I have summarized the whole Message Serialization Format as this handwriting. Here, we observe these:

• Apart from begin_cell() and .end_cell(), it consists of 15 fields of bits being serialized one after another.

• Those 15 fields are grouped into five batches, namely: (a) 0x18 (b) <addr> (c) <grams> (d) `+1+4+4+6...