You can label the bars either in the inside or on the outside. Make all bars the same width and use different colors only when the bars are representing different things. Line graphs should have both horizontal and vertical axes labeled. When time is a variable, make it the horizontal axis. Try to avoid more than three different lines on a graph.
Dot charts show correlation and large data sets.
Label both axes. Keep the dots fairly small. Color is often unnecessary in maps. Label the elements that readers must identify. Gannt charts are often used in proposals.