For HA setup its required helm and tiller both?

Is there any one explain about helm and hiller

also rancher cert manager. is it possible install without cert manager?

I think you mean “tiller”. You need tiller if you have helm v2 (there are special workarounds if you don’t want to have it). With helm v3 you don’t need tiler by default.

You can have TLS on the load balancer level, but you’ll need TLS termination somehow.