It must be a slow day here at Image-Line because we found the time to make a video on using the manual :) In all seriousness the manual is a great and often overlooked resource that is only an F1 key away.
You can download a version of the manual that doesn't always stay on top from our Looptalk forum here. The FL.chm file is attached to the bottom of the first post in the thread. You can also report errors or make suggestions on how we can improve it there too.
The Manual is the collaborative result of over 10 years listening to and watching our customers using FL Studio. The Index tab in particular has been built using key topics suggested by users.
Reading: The manual tries to cover every control in the program and plugins. If you are scanning pages for information we have bolded all the key points, concepts and notes. That means if you just flick your eyes between the bold text you should quickly get an overview of the contents of a page.
Searching: If you have a keyword in mind then use either the Index or Search tabs. Finding the keyword in the Index list will rely on us putting that word in the topic title (and that's where your feedback is useful). The Search tab scans the raw text of every page for your key words, so is the deep-search method. You can also use quotes to search for specific word strings, "vertical zoom" and Boolean logic (AND, OR, NOT etc) to further refine searches.
Bonus: You can find the manual online here, so it's always available wherever you have the internet.
Read and enjoy!