How to fix "connection refused" on raspberry pi 4?

Question

Raspberry Pi

reinstalled the OS
added the ssh file
but still

ssh: connect to host 192.168.0.116 port 22: Connection refused

what can be done? And what could be the reasons?

Answer 1

Well, either the ssh service is not running or the firewall is blocking.
In any case, now connect directly to the rp, and understand

Answer 2

I believe this is due to the disabled monitor.
How to run Raspberry Pi 4 without a monitor?