Audio cuts my video so there is only audio in that section

[shotcut]

Read the tooltip that appears in your screenshot. Turn that mode off (Ripple All tracks) that has an icon like
Ripple means basically “affects other clips”

Glossary / Terminology

Alpha channel An alpha channel is a part of the image data that describes each pixel’s level of opacity or translucency. Contrast that with the other data, which describes light and color. Many people think of an alpha channel as a transparency mask. However, that can lead one to think of it as rather binary - opaque or transparent - whereas most often an alpha channel has at least 256 levels. Aspect ratio Aspect ratio is how the width of a rectangle compares with its height. In other words…