To master not being found out and that is one of the most important parts of manipulation we need to know how people find out you are manipulating them and work from there.
Bullying: you can easily manipulate a person by telling them something with an aggressive face to make them feel they have to. This is an easy way and works but is also easy to be found out as you are doing it voluntarily. The best way to avoid it, is to look hesitant to asking which makes that person have a higher chance of agreeing. This means you both manipulated them and made them less likely to find out.
The manipulator's zone: this is a little bit more subtle and is hard to find in the short-term, but is important to know. It is basically having yourself always choosing the place which always gives you the experience, knowledge and therefore control over the other person. A good way to avoid being caught is giving the occasional yes. Make it into 80-90% where you want to go. If you don't, the person might say no and if you force it will get even worse. Once you give an occasional yes, they will be one; happier with the behavior and two; will always have an instinct to ask you first, therefore, more control
Guilt: as i have discussed before, guilt as bad when used too much making the person less likely to agreeing and therefore more stubborn and harder to manipulate.
Proving love: this one is classic and you probably ran into it once or twice. It is to tell someone, "if you love me, ..." or some variation of that. To avoid being found out, i suggest simply doing it once absolutely necessary. It works like magic, but the manipulated person gains resistance to it.
Emotional blackmail: this manipulation tactic is for cold manipulators and is threatening to kill oneself or dome variation of it to make the other person afraid of going away. This makes an emotional trauma inwhich they get you away from them forcefully. To avoid being detected look as serious and as afraid as possible as you say it and say it when it matters. Most importantly, do it when the other person cares for you more than or equal to himself/herself.
Playing the victim: this is easier done by females as it is socially known and globally stereotypical (no offense). It is showing that you are the victim no matter what happened. It is easy and has a small probability of being found out in the short-term. One way not to be found easily is to accept appologizes quickly (only when playing the victim, if you accept apologizing quickly all the time, you will be manipulated).
Gaslighting: as famous and dangerous as it sounds, gaslighting is to bend truths, deny saying things, stating you said something you didn't etc. It makes the target rely on you moree than his brain but often fails and you will be left away. A better way to do it is by only using it when the subject is unsure. Once you do it then, he will rely on you for his/her memory more and then you will be handed power.
Neediness: easy to perform and amazing in short-term but best used with a huge time gap between them and once it happens act that way all throughout (dont look sick and then jump like a monkey 3 seconds later).
Overdose of kindness: this occurs as you are "kind" with someone and then use it to make them do something. One way to avoid being caught is to not overdo it. Dont be over-the-top kind and nice or they will be suspicious
Overreaction guilt: this is when you are calm when conflict starts to make the other peraon feel like they are overreacting. An easy way and is best used when them overreacting is amost true, in other words, when the situation needs a small amount less of a reaction. At that point you exagerate calmness and collectiveness.
"Joking": this is when you either make fun of them in public or critsizing them and bruahing it off as a joke. Both serve very little purpose other than amuzement and are generaly useless. If you do want to use it then be careful, do it while looking the way you would in a joke and understand when it is most serious or you will have a bad day.
https://www.bustle.com/articles/162103-11-signs-youre-being-manipulated-in-a-relationship-how-to-fix-it