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A circular saw with a guide rail or straight edge, a plunge saw, a table saw or a panel saw.
The last two would only be any use if you have a workshop.
A circular saw will do more jobs but probably won’t cut the ply as well as a plunge saw. But a plunge saw is mainly good at cutting sheet material cleanly and accurately, and less good at other jobs eg cross cutting or ripping timber.
if i wanted to order a slab of birch ply worktop to cut into desks and shelves, what do i need to get started? what type of saw to make sure i get straight lines.