Hi Connor,
Here is a series of animations showing the spectroscopic evolution of a typical type II supernova SN 2023ixf over a period of a year
https://britastro.org/observations/index.php?page=1&page_size=40&sort_order=0&library=1&folder=163&obj1Type=0
Click on each one to see the details
I also summarised them in an article for the Variable Star Section Circular here
https://britastro.org/vss/VSSC199.pdf
I am currently following the evolution of SN 2026sqf very unusual type Ia-CSM. Here are the spectra I have so far
https://britastro.org/specdb/data_graph.php?obs_id=21462%2C21370%2C21485%2C21269%2C21261%2C21235%2C21233%2C21231%2C21207%2C21202&spec_id=0&obs_observer_id=none&multi=yes&mix_flux=no&r_c=0&f_c=0&o_comment=&std_spectra_id=None&legend_pos=ne
Cheers
Robin