user27946: I am a beginner and just starting to explore the possibilities of Bitcoins. So I would be very grateful if somebody could help me with this question. 
Is there a risk that my Bitcoins are lost if the PC with the bitcoins resp. with the Bitcoin wallet stored on it is stolen or has crashed? Thank you very much.  

user27935: Accessing to (your) bitcoin requires a private key.
This is kind a long number password to access the bitcoin on the network called blockchain. 
All bitcoin are saved in this (online) network.
A private key looks like this:
5Kb8kLf9zgWQnogidDA76MzPL6TsZZY36hWXMssSzNydYXYB9KF
Important thing is you save your private key on different places in case you need it back again. One good practice is print it on a paper with QR code. This is called Cold Storage. This is your backup.
Don't show this private key to anyone else and save a copy somewhere else than your home. 
Act like a bank, because with bitcoin you are own bank.
When your PC is gone, you take the private key and setup a new wallet on a device. Amount of the bitcoin will be exactly the same as it was left last time, because it is saved on the blockchain. 
Read more here
https://en.bitcoin.it/wiki/Private_key 

27946: <p>I am a beginner and just starting to explore the possibilities of Bitcoins. So I would be very grateful if somebody could help me with this question. 
Is there a risk that my Bitcoins are lost if the PC with the bitcoins resp. with the Bitcoin wallet stored on it is stolen or has crashed? Thank you very much.  </p>
 27935: <p>Accessing to (your) bitcoin requires a private key.
This is kind a long number password to access the bitcoin on the network called blockchain. </p>

<p>All bitcoin are saved in this (online) network.
A private key looks like this:
<code>5Kb8kLf9zgWQnogidDA76MzPL6TsZZY36hWXMssSzNydYXYB9KF</code></p>

<p>Important thing is you save your private key on different places in case you need it back again. One good practice is print it on a paper with QR code. This is called Cold Storage. This is your backup.</p>

<p>Don't show this private key to anyone else and save a copy somewhere else than your home. </p>

<p>Act like a bank, because with bitcoin you are own bank.
When your PC is gone, you take the private key and setup a new wallet on a device. Amount of the bitcoin will be exactly the same as it was left last time, because it is saved on the blockchain. </p>

<p>Read more here
<a href="https://en.bitcoin.it/wiki/Private_key" rel="nofollow">https://en.bitcoin.it/wiki/Private_key</a> </p>
