well when installing the shower door itself will not leak if installed as guided in the instructions or if done by a professional, pivot shower doors usually have a magnetic seal on the door and small lips to stop leakage when showering.
your tiling around the shower tray consider a tray with tiling upstands, so that it creates a water tite seal between the tiles and the tray, if you already have a tray without tiling upstands there is a product called flexi fix which is a rubber seal that acts as a tiling upstand creating a water tight seal between the tiles and tray.
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