these are two parts of a pattern that I do not understand one bit (down below) if you know how to explain it please do!

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BEG-SHELL DEC (BEGINNING SHELL DECREASE): Slip st in indicated space, ch 2, yarn over, insert hook in same space and draw up a loop, yarn over and draw through 2 loops on hook (2 loops on hook), yarn over, insert hook in ch-2 space of next shell and draw up a loop, yarn over and draw through 2 loops on hook (3 loops on hook), yarn over, insert hook in same space and draw up a loop, yarn over and draw through 2 loops on hook, yarn over and draw through all 4 loops on hook.

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SHELL DEC (SHELL DECREASE): Yarn over, insert hook in indicated space and draw up a loop, yarn over and draw through 2 loops on hook (2 loops on hook), yarn over, insert hook in same space and draw up a loop, yarn over and draw through 2 loops on hook (3 loops on hook), yarn over, insert hook in ch-2 space of next shell and draw up a loop, yarn over and draw through 2 loops on hook (4 loops on hook), yarn over, insert hook in same space and draw up a loop, yarn over and draw through 2 loops on hook, yarn over and draw through all 5 loops on hook.