The bolded word here is the BESTSELLER. This kind of complement is a direct object complement. The adjective overnight denotes to the object bestseller which is an adjective. Another adjective complements another adjective, thus, the term direct object.
A since the sense of fulfilment will bring about more encouragement to continue studies
The masthead I believe. He's comparing himself to a part of a ship. He compares his skin to the wood.
