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.
If you are merely connecting to other devices within your own home network (as per OP) setting up port forwarding should not be required. You only need to set up port forwarding if you want to connect to other nodes on the internet, assuming the in and outgoing connections get blocked by your router.
To set up port forwarding on your router googling for the name of your router / router brand plus the phrase "port forwarding" should yield helpful results. For a more general guide, see here: https://www.wikihow.com/Set-Up-Port-Forwarding-on-a-Router
