I don't want to get too much into it, so I'll be brief
Humans, animals, plants, the universe is energy, this is a fact as energy is neither created nor destroyed, only transformed.
The universe has been the same from day 1, what was before space dust is now what we know as life.
Energy can be controlled, when you're angry or upset and everything seems to go wrong, is because you are pulling negativity onto you.
When you feel like nothing can go wrong and have an amazing time is because you're pulling positive energy.
Karma is just energy, if you're a piece of shit, you will attract nothing but shit and thus sooner than later, your actions will bite you in the ass.
Good karma will bring you tranquility, peace and life in general will be nicer.
So yes, karma is real, is not an exact science so its impossible to pinpoint how it will work.
But remember the 3rd law of physics, for every action, there is an equal and opposite reaction, so all you do comes back.
yep i just did some research. there is no scientific evidence or scientific test that confirms this.
nothing more then superstition and religious beliefs.
so end of my doubt lol.
there are examples of people that did very bad things to other people in life but lived a good life before dying
Unless you lived inside of that persons brain its impossible to know if they lived a good life, having money does not equate having a good life.
Don't want to get technical but most faiths believe in reincarnation, what guarantees you this bad person didn't reincarnate into a cockroach for their next 10,000 lives?
Thinking you can go through life without consequences is a sure way to end up in a very bad place.