First Steps in OsmAnd
OsmAnd's basic functionality is summarized here.
After you install OsmAnd for the first time, all settings are preconfigured to their defaults. In this fashion OsmAnd will work offline (without internet connection), but you will have to one-time download and store one or more offline maps for the countries you need, as prompted.
Map Screen Appearance:
The configuration of your map screen is available via the device's menu button, then chose "Define view" for the basic map layout, and there "Configure screen" to define the map appearacne to your needs, and also select which functional widgets you would like to see displayed on top of your map all the time. Please note that these settings are profile dependent and can be configured differently for the default, car, bicycle and pedestrian use profile.
Chosing the "Touring view" map style under "Configure screen" slightly re-configures the map display itself to prdouce maximum possible detail and open up some more touring optiions like the display of hiking symbols, display of Alpine path categories, or bike tours.
More Advanced Features:
Some more advanced and more technical information can be found in the HowTo articles.
The basic OsmAnd plugins are already contained in the application itself, and their functionality and settings can be activated under Settings in the Plugin Manager.
Some additional plugins are available as separate (additional) downloads, see Section Plugins.