A spirit level works best when it is used to confirm reference lines and bracket positions before drilling, not just to check a result after holes are already in the wall.
Drywall anchor choice should follow realistic load, leverage, and wall condition, because a light picture, a shelf bracket, and a pulled-on wall hook do not stress the wall in the same way.
Floating shelves fail when layout, support points, or load expectations are weak, so a secure install starts with bracket logic and wall reality rather than shelf styling.
Curtain rod installs last longer when bracket spacing, support points, and fabric weight are treated as one system rather than as a quick decorative afterthought.