Groups in Linux

Sometimes i need to add myself into other groups to access certain files or accessing a software.

Currently this is what i have set up for my linux machine. I prefer to have only 1 initial group. In my opinion, the best way is to have users as the initial group. (This varies for different players or grouping patterns in different environment)

To set myself in the initial group in users:
# usermod -g users chongming

To add myself into other groups:
#gpasswd -a chongming audio
#gpasswd -a chongming video
#gpasswd -a chongming floppy
#gpasswd -a chongming cdrom
#gpasswd -a chongming plugdev

Thats the end to groups in Slackware linux