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What are actual benefits for me
You'll know that coin you receive to it is real actual Bitcoin, all the Bitcoin you've received up until now you've been trusting someone else to ensure it's authenticity.
running node is as simple as running core
Core is a node, supporting the network involves other things like being an economic actor, serving blocks, relaying tx's, etc... network related services.
doing things its supposed to do?
Like what? Did you verify the code is what you want it to be? Do you want it to serve the broader network? Do you have the appropriate internet configuration for that?
What is actual utility?
You've never used Bitcoin before, now you can start...
Is it safe to create wallet and hold some sats on this software?
Based on the rest of your questions, I'm assuming not. I doubt you verified the hash of the binary and you probably installed it to a backdoored OS and have 0 network security.
I should also note backups are different than non-bitcoin users are accustom to... Seed phrases aren't a thing in Core.