As I’ve covered previously, most successful stories have at least three different types of plotlines, and most commonly they are the external, internal, and relationship plotlines. Often these plotlines overlap, and almost always they interweave, at least to some degree. There are some exceptions to this; for example, you may have a relationship plotline with characters other than the protagonist, and it may even be, basically, a separate story (a topic for another day).
Many of your scenes will likely interweave these plotlines.