Lots of misinformation in this thread.
If you are going to be using Tor, then it might be worthwhile bookmarking your captcha bypass login link that you can access here (https://bitcointalk.org/captcha_code.php), as otherwise you'll be filling in captchas for 10 minutes every time you want to log in.
Is it safe to use TOR browser as i heard it is a dark web browser where hackers can hack our credentials and information ?
Using Tor will allow you to access .onion sites which are on the dark web, but it also allows you to browser any other "normal" website too. Usual security practices apply, and simply using Tor browser doesn't put you at any higher risk of being hacked than using any other browser, unless you go around downloading random software from unknown sites. Tor is much safer than any other browser "out of the box", since it has HTTPS Everywhere and NoScript installed as default, but obviously these can be installed on any other good browser too.I am asking only about the standalone TOR browser and what you mean by good people use TOR ? so it means bad people use other browsers 
Lots of good and bad people use every browser. As mentioned using a VPN is an alternative although for added privacy
using tor through a VPN gives extra privacy.
VPNs only obscure your IP address from the site you are connecting to. They are generally poor for privacy since your VPN provider can see both your real IP and your traffic, so you are trusting them to not do anything malicious with that data. Many people also pay for VPNs using fiat which is entirely traceable to your real name and address. Using a VPN and Tor together can often make your privacy worse, not better.using tor through a VPN gives extra privacy.
If you really want to use TOR, then maybe you can initially opt to install Brave Browser and chose Private Window with Tor.
Brave browser, with or without Tor, is a very poor choice if you are worried about privacy.If you are going to be using Tor, then it might be worthwhile bookmarking your captcha bypass login link that you can access here (https://bitcointalk.org/captcha_code.php), as otherwise you'll be filling in captchas for 10 minutes every time you want to log in.