IfLater on, if you start to understand this "haste" mindset of Tempo, I recommend to watch professional midlaners playing soloQ, focussing on how they play their own Tempo. Especially take a look at what objecives are being taken, and how, and when.
A: Objectives are the main target for Tempo, as they tend to generate immediate impact onto the outcome of the game in form of map control, which can snowball. Consider, your own gold is (for you) an objective in itself. The goal is to get the most out of the time you spend during the game, no exceptions. If there is something on the map, that can increase the chance of winning, go for it, if it is the best option.
A: Because it will not get you anywhere as for now. In order to proceed to plat+, understanding the core concept of the game-pace is essential. ASpecific tricks can ver yuseful later on, but a bombardment of specific tricks have never brought anyone a league higher, they. They require a lot of time to figure out individually, just to generate small impact on the outcome of the game. If you don't understand how to turn your gold into a win, then being able to get 10% more through counterganks, roams etc. won't get you anywhere further.