Type 1: LAN-LAN connection type.
In this connection type the second router will be connected to the Ethernet port on the first router. Disable the DHSCP server on the second router and it will act like access point.
Type 2: LAN to WAN connection type:
In this connection type the first router is connected to the Internet port on the first router. Computers connected to first router will not be able to communicate with the second router.