Marvin OnumonuNationwide rolled out the Digital Lessons programme across all 605 branches to help people build confidence with technology.
The move came as research found 11.3 million adults lacked essential digital skills.
The lessons are face to face, last up to 30 minutes and are free for everyone, not just Nationwide customers.
They cover topics like setting up devices, opening bank accounts, spotting scams and making video calls.
Since July, over 562 events have been held with support given to over 3,000 people.
Figures showed 4.8 million working-age adults had never been online and over half could not complete all 20 tasks in the UK’s essential digital skills framework.
Risks linked to digital exclusion included fraud, isolation, mental health issues, financial exclusion, employment barriers, lost savings and communication challenges.
Stephen Noakes, director of retail at Nationwide, said: “Digital exclusion remains one of the most pressing challenges facing society today and for many, the inability to access the internet safely can lead to financial disadvantage.
“We launched Digital Lessons in July – providing face-to-face support in our branches for customers who may need some extra help or reassurance to get online.
“We’re committed to continuing this support, helping more customers build the confidence and skills to thrive in a digital world.”
Feedback showed 100% of attendees felt more confident after the sessions.
Average digital knowledge scores rose from 6.28 to 8.98 out of 10.
86% said they would recommend the sessions to others, and content was rated 9.4 out of 10 for clarity and relevance.
