How I Use After effect software for my Now n Next Digital Marketing Agency ?

After Effects is a video compositing and motion graphics animation tool.  You can think of it as Photoshop+Time, rather than a video editor + FX.  As Ishan says, it really depends on what you're needing to create.

Hey sakshi,

Welcome to the community! Could you let us know what kind of projects you're looking forward to working on? If we have a better idea of what you're trying to create, we can help you by sharing tutorials and tips.

Thanks,

Ishan