Welcome and glad to have you join us.
WRT the corrosion. That is the coolant tank to turbo hose I believe. Looks like the hose is leaking around the clamp. Easy fix if that's all it is. Those hoses have been known to crack and start weeping. Mine did that around your mileage. ISTR that it was < $20.00 to fix.
Good luck and keep us posted. Again, welcome.
Check the service record on the car and if there's any question about the age/mileage of the coolant - change it out with Genuine Subaru Long Life Coolant and Coolant Conditioner, both available from your Subaru dealer. There's a "Coolant Change" thread that provides a walk-through/how-to.
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