2 chicks at the same time

Most people usually consider killing Hitler. But if you think about it, there are on average 80 to 30 million sperm in a typical ejaculation. So I'd find Hitler's dad on the street, bump into him and jiggle his nuts a bit. Then I'd come back to see how much history I changed.

I'd first take my time and study how it works and how time itself works, then I'd study a bunch of history, and a bunch of science, once I'm done I'd go back in time to 1,000 BCE Yukatan Peninsula and chill in the beach, meet some locals, have a good time.

Ship my ass far, far into the future to satisfy my biggest piece of curiosity, probably in 100 yr increments or something. Hopefully somewhere with really good line of sight over a wide area, so I can see some "civilization". If it gets really nice, I'd stay. I can try to sell the machine if funds are necessary.

If it isn't particularly nice at some point, there's a nonzero chance I might die on one of my jumps. Avoiding that, I'd jump backwards again far enough to live out my natural life in the most advanced time I can.

Amusingly, despite being a bit of a history buff, I'd have very little interest in actually going back. Even to learn.

Buy a ton of bitcoin

Put the idiot who started all this back on the tree.

I would find that fish that developed lungs and kick its ass.

Go back in time and tell myself that I need to go to an in-state college instead of taking out so many private loans for out of state tuition.

Become king of the neanderthals.

Id take all my savings with me, go back 20 years or so and dump them all into an RSP. Should have started years ago.

give my younger self a blahaj and not elaborate further

Fact check a bunch of historical things.

Would probably (read: definitely) ensure that I have a PC that is not described as an absolute pos in 2009, when I first heard of bitcoin and gave up because it just wouldn't run.

Go see Nikola Tesla with a smartphone and take pictures of his work (with his permission), granted you could travel back. Priceless. Could also tell him how much he shaped the world we live in today with every mobile phone using technology he created (wireless). Although that might break the matrix, who knows.

Slap my younger self upside the head for dating that one girl.

EVIL!!!

Go back to my 18th birthday and invest everything I have into apple shares.

Probably just see some historical events happen, like the signing of the Declaration of Independence, Apollo 11, etc. I wouldn't really want to mess with anything to keep the "timeline" safe.

Guess I'd hop into the future to see how stuff plays out, then to go to the past and fix stuff. Then go back again because I realized the folly of time travel and must stop future-past-me from creating some wacky existence-ending paradox, but the real treasure will be the friends I make along the way and the wisdom I unlock.

Also, I sell the movie rights and retire comfortably.

Go back to 1966 and attend a Yardbirds concert with Jimmy Page AND Jeff Beck on the same stage in their primes.

And after your holiday you return and find the history books changed to Columbus discovering a nearly empty continent in 1492 and a archeological record of a big, continent wide pandemic, killing nearly all of the humans. Countless civilisations crashed by mass deaths…..