How to add to bash $PATH permanently on Linux

I am a new Linux and bash shell user. How do I permanently set $PATH on Linux? How can I permanently add a directory to shell PATH on Linux?
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Linux: TMOUT To Automatically Log Users Out

How do I auto Logout my shell user in Linux after certain minutes of inactivity?
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Bash History Display Date And Time For Each Command

How do I display shell command history with date and time under a Linux, MacOS or Unix-like operating systems? How do I see date and time stamps in bash history command running on a Linux or Unix-like systems?
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Linux: Change the PATH [ Add New Directory ]

How do I change the PATH settings under Linux operating systems and add a new directory to $PATH under bash shell?
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Ubuntu Set User Profile Under Bash Shell

How do I set user profile under bash shell running Ubuntu Linux operating systems?
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Why and How To Customize a UNIX / Linux User Account?

Q. Can you tell more about UNIX user account customization along with some sample configuration?
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How To Turn On/Off Colors For ls Command In Bash On a Linux/Unix

How do I turn on or off file name colors (ls command colors) in bash shell on a Linux or Unix like operating systems?
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~/.bash_profile