A bull market is a condition where prices experience an upward trend due to increased buying activity. Conversely, a bear market is the opposite of a bull market.

To easily remember the difference between bull and bear, you can understand how these two animals attack. Bulls tend to attack by thrusting their horns upward, causing their opponents to be lifted into the air. On the other hand, bears tend to attack by swiping their paws downward, causing their opponents to fall.
To achieve profits, you can heed the advice from @jaberwock mentioned earlier. Acquiring knowledge beforehand, conducting research, and embracing trial and error would be more advantageous than impulsively purchasing assets without applying common sense.
Don't stress your self too much on them. That is already their problem if they lose. Learning is supposed to be free but they choose to pay the price for their wrong actions. Those who learn can still lose but not that often and their losses will only be minimal.
Never hear a news that investing in Bitcoin can make you rich quick but I only see a huge profit on those kind of posts. That still enticed the viewer to follow the same thing. Investing takes time. If someone wants to make a quick money, trading is more suited to this or even gambling. The risk on them are only elevated but gambling can be a perfect fit for those people who skip the learning part.