< /dev/null is used to instantly send EOF to the program, so that it doesn't wait for input (/dev/null, the null device, is a special file that discards all data written to it, but reports that the write operation succeeded, and provides no data to any process that reads from it, yielding EOF immediately). & is a special type of command separator used to background the preceding process.
nohup myscript.sh >myscript.log 2>&1 </dev/null &
# | ^^^^^^^^^^^^^ ^^^^ ^^^^^^^^^^ ^
# | | | | run in background
# | | | |
# | | | don't expect input
# | | |
# | | redirect stderr to stdout
# | |
# | redirect stdout to myscript.log
# |
# keep running the command no matter the connection is lost or you logout# show special characters
cat -v
cat -A