Offer Rejection repercussions??

I have multiple offers right now, and I need to revert back on those soon

I haven’t decided which one I would go for, and hence not sure if I should decline them right away or maybe at later point of time after accepting for now

So, what are the repercussions of accepting it now and decline it later? please add in the comments (I’m interviewing right now and hence if something better comes along, I’ll reject all of them)