1.
It’d is a spoken form of ‘it would’.
It’d be better for a place like this to remain closed.
2.
It’d is a spoken form of ‘it had’, especially when ‘had’ is an auxiliary verb.
Marcie was watching the news. It’d just started.
IT’D
Meaning of IT’D in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012