ins and outs /ˌɪnzən(d)ˈaʊts/
Note: [Usually in the plural.]
1. One who is in office; -- the opposite of out.
2. A reëntrant angle; a nook or corner.
Ins and outs, (a) nooks and corners; twists and turns. (b) the peculiarities or technicalities (of a subject); intricacies; details; -- used with of; as, he knew the ins and outs of the Washington power scene.
All the ins and outs of this neighborhood. --D. Jerrold.