nevermind, asked too quickly…
text wasn’t that clear. But my conclusion:
hard link: if data in one of the hard links or source is deleted it will be moved to the other hard link’s directory. in such way a useful way for data you dont wanna lose, yet only works with files.
junction: links to folders (probably one most suitable)
symbolic link: primarily used in cases where your data is on network server. yet is supporting both files and folders. could be used as well