Help me I’m a newbie, I want to add a access point (Have wireless) with cable at my mikrotik Hex Lite rb750r2(Don’t have wireless). Because I want to control bandwich of my users of my Access point (Have wireless)

What kind of access point is it?
Also do you want to have a house wifi and a separate guest wifi.
What you are asking should be very doable.
It’s a access point( router with wireless) . Yes I only want to have a house wifi.
Well thats a very simple setup that should work with the default settings that come with the router.
Ether1 is typically the wan input
Ether2-5 are on a bridge (on the same subnet 192.168.88.1)
Just plug the AP into your laptop directly so that you can configure it with a fixed lanip of 192.168.88.10 for example
(dont forget to write down the mac address of the access point), turn dhcp off on the access point etc…
https://www.dslreports.com/faq/11233
Also, a starting helper for the router exists here…
https://help.mikrotik.com/docs/display/ROS/First+Time+Configuration
In your case, the router is already setup so its just for information purposes as yours is already setup for the most part.
Once you have the default setup working with your AP, come back and we can add and modify to your config.
Gluck!
Thanks you. It works for me. Thanks a lot. I spend more than 4 days searching answers - ty