You previously mentioned getting some old standard parts which you can use as throw-away items. While that is okay, you need to get some cutting edge parts as well so that you know more than what an outdated part to do. You need to know how technology has evolved, not just where it started.
I purchased an ADA4530-1 op amp as soon as I saw it, without having any initial plans for it. I experimented and came up with my own design of a current to voltage converter which permitted accurate measurement of down to below one pico-amp DC current with negligible insertion resistance. While not designed to maximize its AC performance, it did a reasonable job in that conversion as well.
Long ago, I received a sample NE5534 op amp shortly after it was released stateside. Attached is the New Product Bulletin that came with it. Besides listing its Features and Product Strengths, it also includes a Suggested Sales Presentation listing its benefits over the 741. You can see what they had to do on their bulletin when they couldn't enter a Ω symbol on their bulletin. While not my first NE5534, I also included a look at the oldest one which I still have in spare parts bin. It has a 7924 date code on it. The New Product Bulletin doesn't have a year on it, but I think that it was 1977. I used a lot of those in building audio amplifiers for production rooms which needed their 600 ohm capability. It was the op amp to use for those type of projects for many years. The dual version, NE5532 was released a bit later.
Like the 741, things have progressed since the NE5534 was first released and there are better options for low impedance audio use. But, its replacements are not nearly as much improved as the replacements for the 741 typically have been.