Do passwords/page refreshing compromise Tor security? : Tor | Torhoo darknet markets

Doesn't sound like anything I'm familiar with.
Now, using HTTP (Non secure sites) and putting in your password, the exit node would see your information. Very few sites are HTTP only anymore that require logins, but is something to keep in mind. .onion are not affected, this is with a clearnet HTTP (NOT HTTPS site) over Tor.

Beyond that, no, I'm not sure what you are referring to.

I have always worked in the technology area and for some time I have been researching out of curiosity on the darkweb, just for knowledge and curiosity, I am using Tor and Tails, does anyone have any tips for me? both forums to learn and browser settings or even Tails. :)

The source you have found these information on is not reliable. It really depends on the scenario, but a good understanding of how Tor works will surely clear all these doubt away.

First thing first, you don't want to use any accounts tied to your real identity with Tor, as that won't have any effect and you will lose all the anonymity gained with Tor usage.
Second, I don't see how refreshing a page could actually de-anonymize or compromise you in any way as long as your browser is set to the most secure setting.
Third point, your ISP will not be able to spy on anything you are doing on Tor, only the traffic itself will be visible (if you don't use a bridge or a VPN, better to use a bridge anyway if your traffic is "sensible"), basically the fact that you are browsing on Tor (nothing to fear about, as it's completely legal in most of world).

TL;DR
Those claims are bullshit for the most part. You are safe as long as you start practicing good OPsec.

Stay safe.