How to block opening a file for security purposes

There is a chance my MacBook may need repairs for case issues. I have some personal information on my computer that I want to protect from prying eyes.
How would I do this?
Thank you!

Hi the musigal
You could create a disk image and encrypt it with a password. Move the files into that and delete the originals. On return, copy them back from the disk image to their original locations.
To create a disk image:
Open Disk Utility.
Select New Image
Give it a name, select a size and choose Enrcryption
Click Create
Enter a chosen password twice (make it different to your normal one)
The newly created disk image will appear mounted on the Desktop, if that is the location you chose for it.
Move your sensitive files into it.
Unmount it (eject it)
Test it by double clicking on it, supply your password.
Once opened (mounted), check your files are in there and work correctly.
Again eject it. It can remain on your computer as it can't be opened except by you.
Delete the original files.
regards roam

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