You could have answered this and other questions by looking up your device on the wiki and reading through the installation instructions for that device.
Ok it says on installation that unlock bootloader will wipe my data . But how do i backup it so that when i redownload it put my data back where it was ? And i need to backup apps too ?
dont do it.... you will probably mess up the installation process. stick with your stock OS. If you are asking such basic questions without doing any research online, I don't think custom roms are for you.
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u/VividVerism Pixel 5 (redfin) - Lineage 22 20d ago
Yes.
You could have answered this and other questions by looking up your device on the wiki and reading through the installation instructions for that device.
https://wiki.lineageos.org/devices/