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• you can increase / decrease it's size much easier than resizing partitions;
• if you use LUKS for encrypting your root partition, then you either have to encrypt your swap partition to maintain security (swap can contain sensitive information and are exploitable) or you can simply use a swapfile on your root partition (which is then encrypted along with everything else on the root partition);
• If you encrypt your root partition AND your swap partition, then you will need to enter two decrypt passphrases (one for root and one for your swap partition) unless you also mount your LUKS swap partition with a keyfile (in which case you'll need to edit /etc/fstab and /etc/cyrpttab) - for a swapfile you simply enter one for the root partitiondon't have to worry about any of that;

This tutorial covers setting up Arch (and Arch-based distros like Manjaro etc.) to use a swap file, enable hibernation, and cover a few things in the case of doing this on a LUKS root partition.

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