Not a computer person, but a website I am interested in registering with requires Adobe Flash (along with Microsoft Edge browser and Java). I've seen warnings here and there about Flash being dangerous, but never looked into them from a technical perspective, nor followed up with those news bits (I just chose to never install it). Now, I'm in a position where I would need it for a site to work (although, I don't have to register with that site, as it's not essential for my life). Any idea if Flash (or those other programs I listed) are dangerous to use? Thanks!