I purchased my first bonsai about 4 years ago but haven't taken regular care of it, mainly just watering it occasionally in the summer and rarely during the other months. I've been too afraid to trim it. During the last few months I've kept it by the window and watered it regularly and it began growing much more rapidly than in the past.
First question is, can anyone identify the type of tree?
Second, any tips on where and how far down to trim? The tallest branch is beginning to fall over from its own weight. I've watched a bunch of bonsai trimming videos on youtube, but the trees they trim are in much better shape than this.