Arduino Combine a few working sketches of code into 1

Basically, i am using an Arduino UNO with an IMU to detect and record waves. I am not a programmer but have managed to get some useful files which work somewhat. The main difficulty i face is combining them all into 1 useable file.

I am working on a project in Arduino with limited coding knowledge. I have a few sketches of code which work individually and I'd like to combine them into 1 working code.

Code should be able to detect a wave and measure wave parameters such as frequency, height and period.

thanks.