Keeping your violin in its case when you aren't using it will dramatically lower its risk of damage. The right case will protect your instrument from outside elements, scratches, and even serious damage.
However, not all cases are created equally. Investing in a quality violin case will ensure that your instrument is protected from falls, drops, punctures, and other accidents.There are some things to keep in mind when searching for the right case.
First, ensure that the violin fits snugly inside. The less movement, the better, as this will prevent internal damage and keep your instrument in-tune.
Next, you want to choose the right materials both inside and out. For the inside, softer materials like felt are ideal, especially with padding or cushioning behind it. For the outside, the opposite is best, as a hard shell will protect your instrument from any blunt force.
Finally, you should also be able to strap your violin down by the neck to prevent unnecessary movement internally, especially if you travel a lot.
For a bonus, choose a case that has some extra storage for your violin care kit. From there, develop the habit of putting the violin in its case every time that you're done using it!