Questions about version and features

Hello friends.

with the standard version, I can create an FCI Cluster I have the limitation of up to two cluster nodes. Is there any limitation for number of instances and database?

With two nodes in an FCI cluster with four instances and some bases, do I have any possibility of using AlwaysOn to replicate the bases?

What is the minimum to use an FCI Cluster and also a DataBase Replication AlwaysOn?

Thank you.