The recommended sequence in the above nš 2 post, is that it has the advantage of never having to use a system or component unknown to you, thereby the recommended sequence. Works for most airplane types.
xxx
In example, you cover the basic hydraulic system in general FIRST, before studying the landing gear and gear and brakes, since you better to know how hydraulic pumps and system is configured... The whole study sequence presented is recommended by Boeing.
xxx
Happy contrails