I used a program as a development template in github by downloading it locally.
based on this template, I made a lot of changes. (delete, add and modify)
now the original developer has made a large-scale update to the program template.
I would like to ask your experience, in my case, how to use a relatively simple method, that is, to keep my own changes, but also to use template updates?
because I am not in the IT industry, the problem is relatively primary. Thank you for your guidance.