Basically we don't know the risk in every site if you invest money in a site first is you don't know if the site was trusted there are site that can give you small profit but many site are just scamming people who invested.

Increase and decrease in the bitcoin is a normal thing and it is usual , if you want to buy the bitcoin in any amount for the hold for long time then I will suggest you to first see the condition of the bitcoin in your country and investigate that how your country's government is looking at bitcoin use , whether legal.or not or indirect mean of the government that you can use bitcoin at your own risk ( like in India) .
overall Here I will suggest you to buy and hold Because any laws and rules can't​ destroy bitcoin , since the demand of the bitcoin increasing , so the price will increase and you don't think more about this , just buy and hold .

the same risk you can find in other stocks market, but i actually believthat bitcoin is more secur,e since this is something new, the attention can get only higher

you can safely invest at least 33% of what you have in bitcoin, and anyway it applies always the rule to invest only hat you can afford to lose

just be aware to no fall for those pump and dump traps that you see they are there mostly because of fud and manipulation, keep holding for a much greater value than what we have today

The risk in investments into bitcoin is losing all of money because there are not people who gives us guarantee
 bitcoin will be survive for long time and still there is values in bitcoin,
but if we see on the marketcap.com bitcoin is the best digital coins be compared with other altcoins
so how much do you be ready to losing money in digital coins?, that the amount must be invested in bitcoin.

Just like any other investments, no one can predict how much risk is involved in bitcoin


Again, The price can rise up like we are currently experiencing, and shoot down fast, like what happened when there was drama regarding the scaling issue. If you are going to hold it, just do invest it for long term and try to hold on it as you can till the next halving.

For a long term investment I can assure there will no risk at all, the price of bitcoin only increase as time pass, yes the price sometimes goes down but it goes up after and even go higher at most times. The only risk that is involved is if some unexpected thing happens, everything can be manipulated when it comes to computers. And last thing if you are about to invest this kind of amount be sure that your wallet has a high security.

Like any other investment this will have its risks too so you shouldn't invest more than you can afford to lose. However, it is very unlikely that you will lose all your investment when you invest in Bitcoin. I think in the case of Bitcoin you might lose up to 20% in a short term and if it's a long term investment then it is almost guaranteed that you will be in profit.

risk can't be calculated and it's ain't some obvious shit, all people here speaking speculation, and i tell you, the risk is always changing based on the circumstances, if the risk can be calculated, people won't shit off losing their damn money because there's better option out there which are obvious.

Are you talking about the risk that you have just on storing the bitcoins?
Because if yes, that would be a very hard question to answer, i assume that nobody can tell. The risk is dependant on the current bitcoin price, and you should have already know that it is very high.

In fact, i think that you couls not choose a worse moment to buy so many BTC, the price is almost all-time high which means that it is most likely to see the price chart dipping below current level.

If i can suggest something, then I wouls tell you to just hold on an wait for the price somewhere between 1000 and 1050$, otherwise i would stay away from buying BTC for now.