Recipe Python Beginner 5 min
Fit a curve to data with error bars and draw a confidence band
Afterwards you can fit a model to data with known uncertainties, report parameter errors you can defend, and shade a confidence band around the fitted curve.
3 tutorials
Concept Python Beginner 30 min
The Fourier transform: asking a signal how much of each frequency it contains
Afterwards you can say what a Fourier transform computes, read an amplitude spectrum, and tell how long a record you need to separate two nearby frequencies.
Tool Python Intermediate 30 min
solve_ivp from the ground up: the pendulum beyond small angles
Afterwards you can integrate any system of first-order ODEs with solve_ivp, control its accuracy, and pull events such as zero crossings out of the solution.