There is a bunch of different sites where it is safe to invest  Bitcoin. But before you do this, here are a few things about which you should know. Someone will say that my answer is not quite on the topic, but  someone should write this so that people who have little experience have not lost all their money.

When is the right time to buy?  As with any market, nothing is for sure. Use tools like Bitcoin Wisdom or Cryptowatch to analyze charts and understand Bitcoin’s price history.
Bitcoin is global and not affected by any single country’s financial situation or stability.

How to Invest in Bitcoins and Where to Buy? The difficulty of buying bitcoins depends on your country. Developed countries have more options and more liquidity.
Coinbase is the world’s largest bitcoin broker and available in the United States, UK, Canada, Singapore, and most of Europe.

It’s important to understand how Bitcoin works before investing any money.
Bitcoin is still new and it can take months to understand the true impact Bitcoin can have on the world.

Take some time to understand Bitcoin, how it works, how to secure bitcoins, and about how Bitcoin differs from fiat money.