The best advice I can gie you is that you need to solve the issue that appears when you merge images with videos. Let me be clearer with this: if you use the merging effect (for intros and outros) and you use this option when you marge the last part of the video with a new image placed at the end of the same video, the moment when the video is blurring and the image appears, you can see half of the image on the top of the screen, and half of the video on the bottom of the screen. This only happens when you use this option at the end of your work,

Other video editing applications have dedicated tracks for video, audio, images, effects, etc. Object based editing makes the program more dynamic and easier to manage tracks. This program also employs proxy editing, in which the program creates lower-resolution copies of videos to use during the editing process. This cuts down on the time it takes to import, render and preview projects before you export them. When you’re done, it uses the original source files to export the final project.
Hay un par de cosas que no me gustan tanto: lo primero es que algunos videos cortos (menos de un par de mega bytes) pueden retrasar el software, y te llevará mucho tiempo. para terminar de subirlos a Windows Movie Maker. Por ejemplo, a veces, cargo un video corto para editar, y está listo en unos segundos. Pero luego, cargo otro video más corto para editar, pero esto lleva mucho tiempo para estar listo. Lo último que no me gusta es que el software deja de funcionar algunas veces.