I have one other question. Is there a difference when it says outbound/inbound connection? If yes, how can I ensure that my wallet will always have inbound connection?
Theoretically, yes. Inbound connections are nodes that has initiated the connection and are connecting
to your node. Outbound connections are connections initiated
by your node to other nodes. The polarity doesn't really matter; your node and their node are both receiving and relaying information.
You can port-forward TCP 8333 and other nodes will be able to find and connect to you.