It is helpful to understand how your computer connects to the web, and to have an idea of the components that go into making your connection work efficiently, especially because people currently are so dependent on the internet. Allowing you to get a reliable connection regardless of any limitations, when you connect your computer to the internet via an Ethernet cable, you do so with a transceiver, which converts the data on a wavelength suitable for your unit's specific capabilities.
If you ever discover that you are in need of a replacement part, there are various different modules on the market, and although some are compatible with each other, you do want to be educated on the differences. The majority of these transceivers are swappable, making them simple to change out, but at a glance, they all look extremely similar, so you should be mindful of the subtle differences.
SFP modules are small modules that function as modular connectors, and are attainable for all common fiber modes, wavelengths, and information rates, allowing you to connect multiple interface types all with the same port. Although they're common, does not necessarily mean that you should just estimate that's what you have in your unit, because you could be mistaken, after all, they are one of the most common types of transceivers you're likely to encounter.
You could need to utilize Cisco SFP modules to handle a stronger stream of information more efficiently if you are operating on a larger network, one that needs a stronger connection. These transceivers are made to take advantage of up to a 10 Gigabit Ethernet network, making a steadier connection, with minimal chance of interruption.
It would be fairly tedious to learn about them all and this is only one of intricate facets of your computer, but by widening your understanding of some components, you could be able to service your computer yourself if the situation comes up and do so without having to go out and spend a bunch of money for someone else to take care of something that could be simple to fix.