If watching videos is compatible with your learning style then i highly recommend this whole series on Youtube about Op-Amps, the channel is called RSD-Academy.
This dude explained-it so well that i was astonished as to why i didn't 'get' before.
There is also Dave Jones' op-amp tutorial at EEVBlog (if you like Aussie accents and a bit more detailed/technical explanation yet still targeted at beginners) <https://www.youtube.com/watch?v=7FYHt5XviKc>
Thank you for posting the RSDAcademy channel, you just earned him a new paid subscriber :) His content is a true gem and has finally helped me understand basic concepts like in no other place.
This dude explained-it so well that i was astonished as to why i didn't 'get' before.
[the first video you can skip to 1:45] <https://www.youtube.com/watch?v=7OuUiwI8fDk>
[the whole series] <https://www.youtube.com/playlist?list=PLL_nf1OmixTTd7rEoqoM6...>
There is also Dave Jones' op-amp tutorial at EEVBlog (if you like Aussie accents and a bit more detailed/technical explanation yet still targeted at beginners) <https://www.youtube.com/watch?v=7FYHt5XviKc>