trim

Hi All, Please help with trim instructions for my overgrown bonsai.

Watching YouTube, the best time to trim Bonsai is summer and winter. But, if Bonsai are kept indoors all the time, does the season matter when to trim? That is, if kept indoors, do Bonsai have seasons?

Long time viewer, 1st time poster. I plan on doing some work on this Pyracantha I bought a few years ago. Has been growing in half wine barrel for a couple years. Would like to root prune and do some trim work in a few weeks. Looking to place in an Anderson flat for training. It's just far...