By default a node will have a max 8-10 outbound connections. That means maximum 10 other new nodes could download from your synced node, blocks.
By opening the port 8332 you will increase that number of outbound connections. You can still limit it if you see that your bandwidth and RAM memory is going crazy (because it will) by adding in bitcoin.conf 2 lines:
maxconnections=30 maxuploadtarget=5000
In this way you can keep a certain level of "sharing" if you want.
I would not suggest to do that, only if you have a dedicated machine for such thing and a good connection.
IT WILL SLOW DOWN YOUR ENTIRE NETWORK. Be aware. 8-10 peers is more than enough to "give" to others, no worry.
Thank you for your response, it was very helpful!
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