I know that charm  person makes it so you can socially interact with NPC. But is there a second type.  Succubus and Incubus both have charm person. The charm person though says that they can basically control them as if it is the command spell with unlimited words. So is there two types. one for players for social interaction and another for monster such as the Succubus and Incubus to control players. It says they can attempt another save if a suicide command is given but just for that. the rest is like a command spell or is there just on charm person version. If it is only one version then do the monster control you because they have a 20 for charisma and decent Deception,  Insight, Perception, and Persuasion? Another monster is the  aboleth's enslave which says it uses charm person. There is most likely many more monsters that can do this.

I'm kind've novice as well, so take what I'm saying with a grain of salt. But I believe there is a difference between the Charm Person spell, and the Charm ability you see on the Succubus. 

The Charm ability is not meant to be exactly the same as the Charm Person spell. The Succubus isn't casting anything per se, it's an innate ability that they have, as a Succubus. 

Charm is at a baseline, a condition that gets applied from all kinds of magic and effects - just like the Frightened condition. 

Both of these conditions are sort of like the foundation of the true effect though; depending on which spell or ability caused you to have the Charmed condition, there are often other effects that will happen because of it. It mainly gets confusing because everything is refered to as Charm (the condition) whereas a lot of the abilities also have Charm in their name. 

You're right that it's a bit confusing, though. I've said charm enough in this post that it's starting to feel like a fake word. Basically, unless it's called exactly the same thing (Charm Person) then it needs to be considered a different ability/spell/etc. 

thanks. it confused me because in the detail view about the ability it says charm person.

1. The word "person" doesn't appear anywhere in the stat block for succubus or incubus.
2. Charm person is a spell.
3. Charm is a monster ability.
4. A monster can cast charm person if they are a spellcaster, but that is not the case here.

They are two different abilities, with totally different effects.

The Charm Person spell gives the Charmed:

Charmed

• A charmed creature can't attack the charmer or target the charmer with harmful abilities or magical effects.
• The charmer has advantage on any ability check to interact socially with the creature.

That’s it.

The Succubus Charm feature does give the Charmed condition but also adds on to it with what the feature says like giving commands. 

The charmed condition is not the same as the Charm Person spell 

Quote from Player123456789014786 >>

thanks. it confused me because in the detail view about the ability it says charm person.

 From the stat block

Charm. One humanoid the fiend can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 24 hours.

The fiend can have only one target charmed at a time. If it charms another, the effect on the previous target ends.

I don’t see anywhere where it says charm person. 

I think it is important to contextualize this with creatures that are resistant to being Charmed.  So while the ability may grant powers that are more akin to control or dominate enemy, creatures resistant to charm get their resistance and may not be effected.