Security
We are listed as one of the commercial authors in WordPres.org and hence we follow WordPress theme review standards and codex and hence our themes coding is secured.
You can additionally secure your website by adding SSL, strong password and by using any of the security plugins like sucuri, wordfence, ithemes security, all in one security etc.
You should also take a weekly or monthly backup based on your site changes by using backup plugins like vaultpress, blogvault, backupbuddy and others.