Adding hosts to monitor (snmp)

Hi dear all:
I am a beginner to checkmk. Recently I wanted to add some host (some network equipment in my company) to monitor, but as I understand, I should either install agent on them or use snmp to connect them.
I want to ask, if I only want to use snmp, how should I exactly to do? I followed the videos, but after I put ip addr and snmp authentication, always only ping worked, nothing else showed up.
How should I configure it? what the concept?
Thanks a lot for any ideas!!

Hi and welcome to forum,
first of all which version of Check_mk are you using?
And secondlx, when you add new device you need to do service configuration and choose which services you want to monitor.

Best regards,