Ive got a bitcoin node , where can i read what todo for the hardfork?
Do i have to delete local blocks and and git pull a specific branch?
Try running them in a VM/separate computer as it will overwrite your current blocks.
Most hf clients do try to use the same directory as bitcoin core due to the laziness of programmers of the hard fork.
Look on the specific hard fork websites, ie, bitcoingold.org, bitcoincash.org... These will also give you the information you need on the client that you can read if you wish.