Further reading
To understand more about guides and using views, check out the following: https://helpx.adobe.com/after-effects/using/modifying-using-views.html
To understand more about the timeline in After Effects, click on this link: https://helpx.adobe.com/after-effects/using/composition-basics.html#timeline_panel
More information about masking tools can be found here: https://helpx.adobe.com/after-effects/using/creating-shapes-masks.html#create_a_shape_or_mask_by_dragging_with_shape_tools
imation, follow this link: https://helpx.adobe.com/after-effects/using/setting-selecting-deleting-keyframes.html#Whatarekeyframes