Jobs.ac.uk website has a really helpful and informative careers advice area. Here you will find helpful blogs, stories from other early careers researches and practical things like CV templates and interview advice.
https://www.jobs.ac.uk/careers-advice/
The BERA Early Career Researcher (ECR) Network aims to offer support to those who are in the process of completing their masters or doctorate in education, as well as those who have completed their studies within the past 5 years.
https://www.bera.ac.uk/community/early-career-researcher-network