Looks like no one added any tags here yet for you.
-sT
This flag initiates a TCP connect scan, establishing a full TCP connection with the target to determine if the ports are open.
-T1
This flag sets the timing template to 'paranoid,' which is very slow and designed to avoid detection.
-p
Scan specified ports.
-T5
This flag sets the timing template to 'insane,' which is very fast and increases the likelihood of detection.
-T 1-5
Timing options.
-Pn
Disables host discovery, treating all hosts as online. Port scan only.
-sV
Open ports, version information of services.
-O
Remote OS detection.
-p-
Scan all ports on a target.
-A
OS detection, version detection, script scanning, traceroute
-script=vuln
Scan for CVE.
-sU
UDP scan.