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You can use free SSL/TLS certificates, such as Let’s Encrypt. But there are several reasons why it’s better to buy an SSL/TLS certificate from a trustworthy certificate authority:

• A paid certificate is issued for one year; a free Let’s Encrypt certificate must be renewed every three months. This requires additional resources. Setting up auto-renewal does not guarantee uninterrupted issuance.
• Even minor problems on the server that happen during reissuance can lead to loss of certification, resulting in reduced traffic, increased user distrust, business downtime, and insecurity of transmitted data. During this time, browsers may downgrade the resource in the rankings and will restrict login to the site with a warning about its insecurity.
• Paid certificates work with new and old browsers, regardless of the update date. Free certificates often have conflicts with browsers of outdated versions.
• Free certificates come only at the entry level of validation – DV. They do not contain any information about the organization, which negatively affects the trust and security of users.
• Upon the occurrence of an insured event, the owner of a paid SSL certificate has the opportunity to file for damages and insurance payment.
• Paid certificates have more flexible configurations with the ability to combine multiple options, such as issuance per IP address + Wildcard SAN + SAN.
• Support from a CA is better for paid certificates. If you encounter problems or have questions about the certificate, you can get help from the support team quickly and easily.
• Paid certificates are issued by well-known, reputable certificate authorities, adding credibility to your site from both users and browsers.