The images you have to have in mind are:

Yes, Sheldon he has separate American and British English versions of pages!!!

For example, Kross bicycle (2017) had a Schwalbe tyre with markings:

42-622 (28 x 1.60, 700x40C)

When inflated, the tires were about 3.5cm wide as measured with a ruler.

And the Mavic A319 rim had markings:

622x19C

In this:

ISO (Etrto): 42-622. So:
- 42 is the inner rim width. The actual inflated tire is going to be even wider.
- 622 is the bead seat diameter. The actual inflated tire is going to be even wider.
imperial: 28 x 1.60
French: 700x40C:
- meaning of the "C" asked at: bicycles.stackexchange.com/questions/16190/what-does-the-c-in-bicycle-tire-size-mean
  - www.sheldonbrown.com/tire-sizing.html#french says A is larger than B which is larger than C, and C means 622 mm

Shimano product lines

Overview of Shimano brands 2018: www.evanscycles.com/coffeestop/advice/the-complete-guide-to-shimanos-mountain-bike-groupsets-and-their-hierarchy

Shimano Altus RD-M310: almost cheapest MTB
Shimano Acera RD-M360: second cheapest MTB
Shimano Alivio RD-M410: third cheapest MTB
Shimano Claris: entry 8-speed road bike www.youtube.com/watch?v=6dFQDDg6Wt0
Shimano Sora: 9-speed road bike bike.shimano.com/en-EU/product/component/sora-r3000.html
Shimano Tiagra: 10-speed road bike bike.shimano.com/en-EU/product/component/tiagra-4700.html
Shimano Deore: non-shitty MTB, in increasing performance: M610, M6000, M7000, ...)
Shimano Tourney; commuter, likely the shittiest of all lines: bike.shimano.com/en-EU/product/component/tourney.html

Video 1. What Elon Musk's 42,000 Satellites Could Do To Earth by Tech Insider (2020) Source. Good primer. The main difference from older systems is that they fly closer to Earth, and are not geostationary. As a result, you have better latency. But you also need a bunc of them to have continuous coverage of an area.