This chapter has introduced you to the basic concepts of file security. If used correctly and with a pause for thought you will have no problems. A slight slip of the fingers when typing a chmod -R command from the root directory can take ages to get the system back to its correct access permission mode, so please don’t wear plasters on your fingers when you type that command!
The use of suid scripts is down to you. Use them but make sure you control and monitor their use, and please do not use ‘root’ enabled suid scripts.