I need help with these problems I'm having

Ok, so I have a few different problems that I need help with fixing. I just noticed that there are ants crawling around on my plants and I'm not sure how to get rid of them. I just sprayed them with neem oil about 4 days ago but then the ants showed up after I sprayed. I heard that sprinkling cinnamon around the base of my plant and around the container keeps them away, but would cinnamon harm my plant at all? The second problem I have are some spots that are on some of my leaves. I'm thinking that it might be calcium deficiency or pest damage or maybe even a ph problem but I'm not sure. The last problem that I have is these marks that I noticed on the stem of my plants. Is this normal as they get bigger or is this something that needs to be treated?

Are you sure they are ants? I have no experience with ants but they do sell ant traps at homedepot cheap.

I would say there thrips by looking at picture 1 , but the other 2 looks like you dripped some water on the leaves and they simple got burnt.

Thrips tend to not really be a major problem but I spray with bugbgone even if i dont see bugs (only in veg) just as preventative maintenance every 3-4 days for 2 weeks. Make sure you spray with a wetting agent(dont buy it .....you can use a few drops of dish soap).

Bugs can be a nightmare make sure you keep up with them and dont ever start flowering until there completely gone.

Bro, you need an ant eater................naw bro, call your hydro store and theyll give ya somthing to kill em.

ants usually eat other bugs and not cannabis so if you have them you most likely have a pest that is a food source for them