…(more) Good
old LM741 is hard to beat if your not looking for extreme performance.
Cheap and easy to find. LF353 is a good choice if you want a dual. Also
faster than the 741 and it’s got a FET input structure if you need that
sort of thing. Most of the singles have the same pin out and so do the
duals. All of these may be Googled for data sheets and sample circuits.
Have fun. Parts Assortment\
https://amzn.to/3gOhf5h
https://amzn.to/3Jv2Gjd