Is bitcoin still a good investment for newbies? Is it worth to pay almost $8200 for 1 BTC today?
First, keep in mind that you don't have to buy exactly 1 BTC, you can invest just $100 or $1000 or $20 because Bitcoin can easily be split into smaller units.
Generally, before you invest into something you study it first so you can form your own opinion where the price will go or how it will react to future events, how risky it is to invest and many other things.
If you will have knowledge you will also be able to protect yourself from hacking, accidental losses of funds, all sorts of scams, including minority forks that claim to be "the real Bitcoin" and so on.
When you will make your first buy, there will always be a possibility that it will crash, maybe for a very short term, maybe for longer, but I suggest to treat Bitcoin like a long term investment and hold it for years - trading can easily decrease your portfolio, especially if you are a newbie.