Cyber Law question: exactly what kind of devices can I scan and try to exploit?

I love learning about network security and penetration testing stuff. I do my own exploration at home using tools on kali Linux. But I don’t quite understand the whole “you can only scan your own devices and network”, I’ve run nmap scan on my home network but can I also scan the my router, which the ISP gave me? If I bought it is it MY router or the ISPs?And if so how deep can I run scans? For devices like my android phone or HP printer the device was made by the company but if I “own” them can I attempt to for example penetrate it by brute force or run exploits with metasploit? Just asking so I can learn more about cybersecurity safely. submitted by /u/Only-Commission-6304
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