What SSD size can an HP 14-bs0xx laptop take?

Capacity isn't really the limit on that one, it's the type of drive. The 14-bs line shipped with different storage depending on the config, so check what's actually in yours before buying. Take the bottom panel off and look whether it's a 2.5 inch SATA bay or an M.2 slot, or run Crucial's system scanner tool which reads the board and tells you what fits. As long as the form factor and interface match, 1TB or 2TB SATA drives work fine.