PuTTY does not have an export feature for settings, so when you switch PCs you may wonder what to do. PuTTY settings are stored in the registry, so you can extract them and move them over.
How to Do It
Open Command Prompt and run "reg export HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions Putty.reg" (administrator privileges are not required). The part after the space at the end is the output file name, so you can name it whatever you like.
In this case, a file named Putty.reg is created, so copy it to the destination PC.
>reg export HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions Putty.reg この操作を正しく終了しました。
If you want to export all PuTTY settings, use "reg export HKEY_CURRENT_USER\Software\SimonTatham\PuTTY Putty.reg". This is the recommended option.
To import it, run the following from Command Prompt.
>reg import Putty.reg この操作を正しく終了しました。
Test Environment
Windows 10 Pro 1909
PuTTY 0.73

It is convenient to keep `Putty.reg` in OneDrive together with the standalone version of PuTTY (putty.zip).