I'm not sure, but in image #6, it looks like there might be some green aphids perched along the stem and the main vein of the leaf. They're very common plant pests and like the tender new growth. They suck the sap from the plant and can cause distorted leaves, which might appear
as though they had been "chewed." They can also spread some diseases from one plant to another.
When treating a plant with soap solution, it's first important to be sure you use real soap, not detergent. Detergents can burn the leaves, which will cause them to dry and fall off. Read the label on whatever type of "soap" you intend to use, to be sure it's actually a soap. Dishwashing liquids are usually detergents.
You must apply several successive treatments of soap solution, in order to kill any newly hatched insects, as well as any the first treatment might have missed. It's a good idea to re-treat every 5 to 7 days. Four treatments should be sufficient to clear any infestation of soft-bodied insects. Other insects, such as scale, which produce a protective waxy shell over themselves at maturity, are somewhat more difficult to eradicate. But there are ways!
ETA: the "bumps" on the stem, where the leaves used to be, are called "nodes". New leaves and branches will sprout from them as your plant recovers from whatever is ailing it.