There's a blocks folder chainState folder database folder then there's .lock folder DB folder debug folder peers.dat And my wallet. Dat I'm not sure which one of these you want me to open just let me know please
The easiest thing to do if you want to resync (start from scratch) is to just delete everything in this folder (and all it's subfolders), leave only the wallet.dat (and the peers.dat if it exists).
Before you delete everything, first shut down the wallet.
Then delete everything.
Then restart the wallet.