I have now a LN channel with 108k sats balance and 14.5k inbound liquidity (whatever that means lol!) Yeah, I'll do some more homework... when I'll have time for it.
At this state you can send roughly 108k sats, i.e. that is your current outbound or sending capacity. With 14.5k inbound capacity (without prior sending!) your channel can immediately accept a payment of 14.5k sats to your LN wallet. Your Phoenix channel's total capacity is thus 122.5k sats at this moment.
Phoenix usually gives you about 10-15% of the funding amount as inbound capacity, so that you can immediately receive small payment without prior sending.
When you fund a "normal", say LND, channel with 110k sats, you have around 108k outbound capacity and zero(!) inbound capacity. With zero inbound capacity your channel can't accept a single sat. So to get inbound capacity for such a channel you need to spend some sats first. If you send e.g. 38k sats, you end up with 70k sats outbound capacity and 38k inbound capacity.
It takes a bit to get the hang of it...