[SOLVED] How to choose the right router?

[fernandopicoral]

You can see a lot of different opnions here

Hi there!
I'm changing my internet provider and I would like to change my routers as well because they are quite old (2014) and I'm not sure if they will handle my new internet.
I had 15Mbps (not fiber) and now I'm changing to 100Mbps (fiber).
I'm trying to choose a good router but it's quite difficult because I don't have a lot of knowledge on this field.
In order to choose a good router, I would appreciate some help with these questions:
(If you don't know the answer for all of them, there is no problem, any help is welcome!)

• 
  What is the difference betwen LAN ports 10/100, 100/100 and 10/100/1000?
  -The router bandwitch in Mbps
  What should be the router speed in Mbps in order to handle my 100Mbps connection?
  -100 but since there is no price difference betwen 100/100 and 10/100/1000, you should go for the 1Gbps
  What is the best option in wireless IEEE standart? 802.11ac or 802.11n?
  -802.11ac
  What frequency should I choose? 5ghz, 2.4Ghz or a router with both frequencies?
  -5Ghz is faster but the range is shorter than 2.4Ghz. You should get a router with both.
  What does the antenna dBi mean?
  It's a way of measuring antenna gain. It's essentially how powerful the antennas are. Some countries have restrictions on how powerful they can be without licensing.

I have to use two routers to get wifi in my house, one at the living room from wich I connect my second router, that it's at my bedroom and, from this router, I connect my computer. Do you think that this can harm my connection?

Is there any difference in connecting my computer on LAN port 1, 2 or 3 like priority or something?

Do you have any router to recommend me?

Sorry for this massive post but I really did not find any good information about that.
Thanks for the help guys!

 

[Alabalcho]

Why you did not post your answers in the original thread, whatever it is, and bothered to copy/paste?

 

[fernandopicoral]

Why you did not post your answers in the original thread, whatever it is, and bothered to copy/paste?

What do you mean with that?
I asked the same thing on both forums to get my answers the fastest as possible and I put the answers here to help other people that may come looking for the same thing.

 

[QwerkyPengwen]

no such thing as priority between lan ports. It's just numbered so you can manage which device is which when looking in the router settings.
I personally have and recommend the TENDA AC1200 (AC9).
https://www.amazon.com/Tenda-AC1200-Wireless-Router-AC6/dp/B01COA6SNG/
Works perfectly and is quite affordable.