There are plenty of meetup groups for different tech subjects in Cardiff (and at least one for journalists). They range from simple coding spaces for help learning the basics, to languages (Python, R) or topics like UX or machine learning. And if you want to hop on the train, you’ll find more across in Bristol.
There are plenty of Cardiff Meetup groups. Some of these stopped completely during the Coronavirus pandemic but many of them simply moved online and are still taking place.