Rinse out and leave in conditioners contain many of the same ingredients, sometimes rinse out are thicker/ richer. Companies prefer you to use rinse outs because you use more, waste more and buy more.
Assuming the product is CG friendly no specific ingredients should not be left in your hair they are all fine. The amount you use depends on your hair type and the specific product, use enough to start clumping and get a squishy 'seaweedy' noise.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.