Make Virtualbox know which folder you want to share
Devices -> Shared Folders -> Add New Shared Folder
Fill shared folder destination and its name for calling in the guest (Also tick read only or permanent as you wish)
In the guest's terminal
Create folder somewhere you want which the name as what you defined.
Use this command
sudo mount -t vboxsf [folder's name] [the path where the folder is at]
credit : Sharing Folders Between Host and Guest
This link and this link explain it really well and concise
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