Bitcoin is well known for its safety. The biggest dangers are mainly hacker attacks on third party services, through which one accesses his bitcoins. These are above all the various crypto exchanges on which the users have created accounts or the bitcoins stored locally in wallets.

Basically, either the exchange itself is directly attacked, so that data can be stolen there. The biggest known incident was the hacker attack on Mt.Gox about 4 years ago, when a huge hack of Bitcoins was looted. This was also the reason for the decrease of Bitcoins 2014.

Today, the exchanges have improved to prevent such occurrences, because it can come to hacks and the trade is severely restricted or even stopped completely. This often leads to strong price fluctuations, mainly caused by so-called panic sells.

An equally large attack surface offer individual mistakes that can easily be prevented. Individual mistakes are the responsibility of individual users and are often:
- insufficiently secured user accounts due to weak passwords
- Login on a phishing site
- send the private keys to a scammer

If a stranger has once gained access to your own accounts, he can quickly transfer the entire balance to another wallet and due to the anonymity, it is no longer clearly comprehensible. For such a kind of total loss helps therefore only a careful handling with your personal user data.

But as long as you follow to the usual security rules and pay attention to secure passwords, which you should also change from time to time and do not use the same password on many other pages, an accident normally cannot happen.
The high demand and high competition between exchanges has also contributed to the improvement of safety standards.

How make you sure to safe your Bitcoins?

I do not think that bitcoin will be enough if the whole people around the world will going to buy bitcoins. There will be too much shortage on bitcoin supply and this will lead also to have an expensive market price for bitcoin. As we all know that there are billions of people around the world and bitcoin supply is only limited. So meaning to say in the near future there will be a shortage for bitcoin supply and thus will lead to create another dominant coin like having ether as one of the possibilities that it will be the next to bitcoin. As of this moment i am seeing this already closely to happen. What do you think?

It's the opposite of what you say. If everyone really did hold their BTC rather than sell and the demand stayed the same, then naturally the price would go up as supply would be lower. Simple economics.

Math > Emotion = Profit 

If I'm not mistaken, in the US there are some courses that are offered which give some intro into cryptocurrencies; but it doesn't really make sense to me why you would want to pay big money to some college to teach you the basics of Bitcoin.  Everything about Bitcoin is "google-able" and you will probably find out a whole lot more by asking questions to people on forums like these or Bitcoin's stack exchange forum.

It just seems dumb to "make a job" out of this.  To me this is/should be more of a hobby type of thing.

it's the million dollar question , the problem is that we keep hearing the same question after bitcoin huge pumps and we never hear it when the price dump
theoretically it's always good to buy assuming that people will stay interested in bitcoin and will keep buying and using it
but no one can know if the price will keep going up now or will it have a correction for like 5 or 6 K , in the long run the price should go up but if people buy now there is a good chance IMO that they may wait for some time in order to profit ( this may not happen but still there is a chance )
 

Yes, bitcoin can reach $25k, $100K as well, also can fall to $1K, nothing is certain in crypto, because everyone makes predictions according to today's conditions. Tomorrow's conditions can make $1K prediction logical.

I just wondering if a newbie like me just joined a campaign recently or i dont know maybe im not yet involved in thier campaign. Do you think it is bad to use thier code when you see your name in the spreadsheet? And what is the meaning when your name is on a violet color ? What does it means ?