i want to send private documents and things to someone, whats the best app in your opinion. needs to work on linux and other things too
Magic Wormhole is a popular tool:
The protocol is open, so there are apps that are cross-compatible.
for example
Android: https://play.google.com/store/apps/details?id=com.pavelsof.wormhole
Windows: https://www.microsoft.com/store/apps/9P564W951H6N
macOS: https://apps.apple.com/app/riftshare/id1602642908
Can be installed on Linux, Windows and MacOS. There’s an open source client on Android as well. If you don’t want the hassle of installation, there’s a website: wormhole.app. Claims E2EE and open source algorithm but the client itself is not open source.