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| 1. What software do you recommend for editing PDFs? Or to fill out and SIGN templates? With the Mac I use Preview, is there something similar to this?
If by sign you mean "insert an image a scanned signature" (and not a cryptographic signature), LibreOffice can edit PDF natively, see How to Fill and Sign PDFs in Linux.
| 2. How can I record a video of the screen with sound coming from a mic?
SimpleScreenRecorder works fine for that.