New pool owner, how concerned should I be about a handful of spots like this in my pool? It looks like I can see cement in the “holes” as pictured.

It’s a 30k gallon rectangular pool. There are a handful of spots like this, and a few more that look like they were possibly patched. I haven’t noticed water loss or anything like that.
1. Do I need to do something about this immediately?
2. Can I patch them short term?
3. If I need to resurface the whole thing, where do I start?
4. The discoloration pictured (besides the “hole” - is this because it was previously painted and has deteriorated as I hear paint does?
5. Can you tell what type of pool this is? Everything feels like cement I guess, but I don’t think that’s a thing from my research.

It’s a 30k gallon rectangular pool. There are a handful of spots like this, and a few more that look like they were possibly patched. I haven’t noticed water loss or anything like that.
1. Do I need to do something about this immediately?
2. Can I patch them short term?
3. If I need to resurface the whole thing, where do I start?
4. The discoloration pictured (besides the “hole” - is this because it was previously painted and has deteriorated as I hear paint does?
5. Can you tell what type of pool this is? Everything feels like cement I guess, but I don’t think that’s a thing from my research.