Some tools require that a user become certified to operate the tools before they may be used. In general, these certifications are relatively informal. Anyone who is certified to operate a tool may train and certify another person as long as they feel comfortable doing so - with a few exceptions.
If you would like to become certified to operate a tool, attending an open house night is a good option. Tool sign-offs are a part of the open house nights, and knowledgeable members are usually present. Another option is to reach out in the Telegram channel. This may be best if you want to become certified on a less-common tool or are unavailable during the open house nights.
There are a few tools with special certification requirements: