You can make, save, edit, and insert blocks for drawing items that you use often, such as standard notes, title blocks,
label positions, and so on. You can attach blocks to geometry or to drawing
views, and you can insert them into sheet formats.
It is an incredibly useful tool, however when most SOLIDWORKS operators use this function they select items in the graphics area and click Tools > Block > Make. Whilst this is not too labour intensive, a more efficient method does exist. Whilst in your sketch, right click anywhere in the graphics area and click > Make Block.
If you use this tool a lot this little tip could save a lot of valuable time.