Bellhart’s silkbound townsfolk are freed by defeating Widow in the chambers above town. This walkthrough shows the quickest way to reach that fight, the one prerequisite you need, and what Bellhart offers once the curse is lifted in Hollow Knight: Silksong.
Prerequisite: Get Cling Grip in Shellwood

You’ll need the wall-climb ability (Cling Grip) from Shellwood to reach the boss above Bellhart. If you haven’t cleared Shellwood yet, do that first.
Step 1: Enter Shellwood from Haunted Bellhart and progress until you reach the central elevator and mid-zone bench. Activate the bench to establish a local checkpoint.