Warning: Before updating, make sure that you’ve backed up your code or that you’ve used a Child Theme.
Using a Child Theme
When updating themes frequently, it is important that you use a Child Theme for your customizations. Otherwise you risk losing all of your work when you update the parent theme. More can be read into detail here. You can save many hours knowing how to work with Child Themes before it’s time to update.
Updating free themes
If you are using a free theme from wordpress.org, updating is super easy. As soon as an update is available, it will appear in your WordPress dashboard. Just click update there and your theme will be the latest version available.
Happy updating!