Replacing a fragment in track

I created a track - I recorded an audiobook. Then, when I listened to the track, I found mistakes, and I want to fix them - record a new fragment instead of the fragment containing the mistakes. How can I do it?

https://youtu.be/PF4WuOKTMvo?t=8s*
https://youtu.be/15XdeMw7N3A

[* rather than amplify by -50dB to silence, select the audio to be silenced then press “Ctrl”+“L” keys].