Fundamentally, you should not share passwords
1. If only one person needs a password, they should always create a password themselves. For example, you might hand them a newly provisioned laptop with a temporary password to login. The first thing they should do is change the password.
2. Multiple people using the same password is bad practice. Whenever possible, each person should receive their own user with their own private password if they need long-term access.
That said, sometimes a shared password is a simple practical solution. You could:
- Write it down on paper and hand it to them
- Use a password manager that allows sharing. Several password managers can do this (LastPass, 1Password) but it is a paid feature (inexpensive though at $4/month or less).
- Host a password manager yourself, such as BitWarden. You will need to ensure it's configured correctly and securely, host it somewhere you control/trust, and maintain it.
- Use a secure/anonymous (file) sharing service. I couldn't recommend one myself.
- Use GPG/PGP or similar, to encrypt messages and send them via email.
At my job, we use LastPass with shared folders for certain credentials. At home, I write passwords down to share with my family.