2 subnets one gateway how to configure on Mikrotik?

Question

Mikrotik

Tell me how to set up 2 subnets that do not intersect, so that both have access to the Internet

Answer 1

to each bridge (port) you add the ip of the desired
dhtsp network to each network on the network interface you
prescribe nat to each network
in ip-route-rules you prescribe ip networks and the unreachable rule
vlans load the CPU

Answer 2

For example, set up 2 bridges on Mikrotik, and release each of them to the network.
Or use VLAN. Or in a bunch of other ways.