I know I need to synch them, but it's not clear to me if the inventory synch takes place automatically or if there will be something else I need to do??
Unfortunately you will need to use a third-party solution like Trunk to keep your stock in sync between the two: https://trunkinventory.com
@kathleencarroll Square and Squarespace are two different companies, and I don’t think there’s an integrated inventory solution, so I believe @axsuul @is correct.
But if you use the Square Online (formerly Weebly) store, or another site that directly integrates, then your inventory would automatically sync constantly without having to do anything
Square Community
Square Products