It would take several volumes to explain. And I'm not even equipped to talk about it since I took 1 class that briefly covered 18-21 century philosophy. There are more nuances to these terms that I don't know about that involve social, economic, ideological and other aspects.
In general, communism is like a typical family unit — everything belongs to everyone, no money, no class, and everyone work as much as they can. Completely utopian and unrealistic for humans.
Socialism is kinda complicated, in general, it's about people owning means of production. Meaning, that you working at McDonald's will own a share of what you sell, not a salary. And no CEO would get a two-million dollar salary.
Marxism is a theory about class struggle, which is the one and only hierarchy that has to be abolished. Marxists believe abolishing them would solve all the societal problems.
These are very simplified explanations. In general, they have many things in common, mostly a view of what's beneficial to the community at the expense of an individual. Which I agree is more a female trait. But I, for instance, support free healthcare like in Canada (which isn't free at all but is still better than fucking bullshit that's going on in the US). It is a socialist opinion. I also understand that if capitalism was let to develop freely with nothing stopping it, there would be more pieces of shit like Martin Shkreli going free, and I don't want to live in that society.
So, some ideas make sense, other doesn't. It is practically impossible to implement pure socialism, or pure communism or pure capitalism due to human nature.
But using these words as a red-scare is dumb and it is diminishing your credibility because it shows you have no idea what you are talking about.