Searched on various forums, everyone seems to have conflicting opinions.
If I want hibernation to work correctly on my laptop , do I need to allocate swap equal to RAM (some are also saying double 😥) I have 16 gigs of RAM, so allocating 32 gigs (or 16 gigs) swap seems like a waste of space. Will do only if absolutely necessary.
I am running manjaro KDE by the way

You should be good with 1.5x your memory, so 24GB in your case. It's not a waste of space. You want to avoid a situation where OOM starts to randomly terminate processes to free up memory, because that doesn't normally end well. That should give you enough for hibernate plus normal operations.

Don't hibernate. Turn the thing off. Saves a lot of trouble in the long.
A Lot Of Trouble.

@magicMirror agreed

@magicMirror @iAmNaN What kind of trouble ? I just found out about it recently, and seem to like it...
I mean it resumes in the same state while actually powering off...

@Konsole
Ubuntu + hibernate can work. for a bit. then it stops working - maybe you updated the kernel, maybe some other update broke it, who knows. And you waste more time trying to fix it. Then the laptop will not return from hibernate - so you force poweroff, and start again.
And after a few times of that - the laptop does not come back, and you have to reinstall the OS. And play with the hibernation thing again....

Sage advice - turn the thing off. Long run says hibernate is not worth it.

@magicMirror Oh!. Thanks. I use Manjaro, and hibernation comes pre-installed in it. Didn't know Ubuntu had the feature too. Never saw it

@Konsole well... gl then.