This explains clearly how to get started in CapCut :D
Getting Started with CapCut
Download the app. CapCut is available to download on iPhone and Android devices. Navigate to your respective application store (i.e. Apple App store or Google Play Store).
Tap on the green ‘Confirm’ button. This acknowledges that CapCut needs access to your photos. On the next pop up window, tap the button that allows access to all photos.
Familiarizing Yourself With the Interface
Start a new project
Select a video clip
Get to know your workspace. CapCut directs you to your primary workspace after you upload your first clip. This is where you will spend most of your time in the app. From top to bottom, there's the preview panel, timeline, and toolbar.
View the preview panel. This is the top half of your screen and it displays a preview of what your edited video clip will look like.
View the timeline and toolbar. These are the bottom half of your screen. The timeline is below the preview panel and it is where you will perform all your edits. The toolbar at the very bottom of your screen contains all of your editing tools like split, audio, text, stickers, effects, and more.
Basic editing
Trim video clips. Trimming means that the part of your clip that used to be between the thick white line and the adjusted playhead will be completely cut out.
Join video clips. If you want to add more clips to your project, use the ‘Join’ tool to do so. Tap on the white "plus" button on the right of the timeline. Then select another clip, tap on its thumbnail, and click "Add" in the lower right corner. You will now see the new clip located to the right of the old clip on your timeline!
If you want to switch around the chronological order of your clips, simply press, hold, and drag a clip in the timeline and to your desired location (i.e. placing the new clip to the left of your old clip to make it play first).
Split video clips. To split a clip in two, drag the timeline until the playhead is where you want to split. Tap on your clip, and then on the “Split” icon in the toolbar. Your result will now display two separate clips, rather than one.
More advanced Edits
Change the speed of your video. Speeding up or slowing down a clip is a popular feature that many people use for TikTok videos. Tap on a clip in your timeline, then tap on the "Speed" button in the toolbar - the icon looks like a small circle inside a larger circle. Normal is the entire clip and curve is throughout different parts your clip.
Reverse a clip. To put your video clip in reverse, tap on the clip and then select “Reverse” in the toolbar - the icon looks like a triangle inside a circle.
Tap "Audio" in the toolbar to add some background audio. CapCut has four options for types of additional audio. Tap “Sounds" for music, "Effects" for sound effects, "Extracted" for the audio from any video in your camera roll, or "Voiceover" for a voiceover recording.
Type out text. Tap "Text," type something out, and then tap on the text in the preview screen. Now you can change its appearance by tapping on any of the icons in the toolbar. These include things such as "Style" (changing color, font, size, etc.), "Effects," "Bubble," and "Animation." You can also add stickers.
Add different effects. CapCut's effects are separated by "Video effects" and "Body effects." "Video effects" overlay the effect on the entire video screen, while "Body effects" detect any bodies within your clip
Apply a filter. CapCut also gives you a plethora of filters to change the overall color appearance of the video. Select a category (including styles such as "Food," Movies," or "Retro"), then tap on any filter within that category. Again, tap on the bottom right check mark to apply it.
Undo an edit. If you ever complete an edit that you don’t want to keep, you can easily undo it. Simply tap on the back arrow located directly above the timeline to reverse an action.