What is the way to communicate privately? Messenger or mail? I work with different companies and pass on new information about my project. I don't want this information to be known before I finish. I will be glad if you can help me.
You need chat apps that are privacy oriented. I mostly use Signal but it has a weakness so do your own research and learn about privacy. The rule of thumb is that all devices are susceptible to leak some data. Did you see how Snowden secured his device... that was funny. Check this link, it might be very interesting to you: https://www.eff.org/node/82654 Edit: Snowden's video at youtube
In addition to what @sarahk offered, be judicious as to whom and when you release information to. Release early information only on a "Need to Know" basis and be judicious as to what information needs to be known early. You are the best protector of your own secrecy and/or privacy.
Those issues with information leak can be also caused by harmful programs (malware), which transmits your data to third parties. That's why it is a good idea to use anti-malware tools, at least free.
Well, the basics are to change the software you use: Firefox or Midori for web browsing Silence, Signal or, if nothing better, WhatsApp for instant messaging over the phone Syncthing for file-sharing Learn how to encrypt emails with GPG The next step would definitively be to switch to BSD or Linux operating system, because the other two are considered spyware these days.
I can advice you to try Utopia ecosystem. You'll find both functions there and moreover a channels, browser, mining and so on. It's quite private as it is decentralised peer-to-peer network. So all your data will be safe there. Btw, it's absolutely free to use.
here I can suggest some of standard way to communicate privately. I assume you are aware of protonmail kind of encryption service you can use PGP/GPG encryption method to communicate privately, google will help you to learn this method, and if you really need hardcore secure communication way than check about steganography, which is used by the army and other defense departments to communicate securely.