rekordbox website has FAQs for many different questions.
Please click here before posting questions or comments in the Forum.
You may find an answer to your questions there.
If you input a key word in the Search field, you will be able to find some tips to your questions.
Also, please click here to find the following manuals of rekordbox in different languages.
rekordbox Manual (11 different languages)
rekordbox video Operation Guide
rekordbox dvs Setup Guide
Pulselocker Operation Guide
MIDI LEARN Operation Guide
Default keyboard shortcut references
Connection Guide for PERFORMANCE mode (CDJ/XDJ/DJM)
Hope you will find an answer in FAQs and manuals.