Im reading this link to secure my router: https://wiki.mikrotik.com/wiki/Manual:S ... our_Router

In this document they talk about dissabling MAC-Telnet and MAC-Winbox. I understand that MAC-Winbox is releated to allowing router access through the Winbox software. What services does MAC-Telnet control? (ie, what services would I test to see if it is on or off?). Thanks.

MAC Telnet and MAC Windows are direct L2 connections to the Telnet and Windox services - without using L3.
(so there needs to be no IP addresses on the client (PC) and the server (router) to be used)

These are used as last-resort management, if IP access is lost (due to routing issues, addressing miss-configuration, cutting yourself off with the firewall, etc.).

Winbox (and Telnet) can be used normally (that is using it with L3 address), or using these "MAC" variants which don't require L3, only L2.

For MAC-Winbox, you use this if you enter the MAC address into Winbox instead of an IP.
For MAC-Telnet, MikroTik has their own MAC-Telnet client (https://mikrotik.com/download/neighbour.zip) or there is a Lixnux "mactelnet-client" package.