Portraits can seem daunting especially when you first starting out. I will not speak about street photography, or street portrait as it can be two types - the ninja style where you do the deed without the subject knowing and the other where you chat up the subject and ask for a picture.
These shots are done with instructions from the photographer and you do not need a camera to get trust from the subject. Directing subject is one of the key ingredients when shooting portraits. And to know how to direct the subject, you must have an idea on how a good portrait should look like.
In this example during Sony's product launch of their new Sony Alpha 7 Mark 5 camera, Sony has set up a nice 'gym' in the middle of the mall with continuous lighting of blue and warm colours. When I start to shoot, I try to remember the gym shots I have seen online and in magazines. High contrast, low key portraits pops to mind.
Next is to see what the model/subject is capable of. If he/she can follow instructions just give an example of what you want them to do and they will mirror the pose. After which I will micro adjust where the look, where they put their hands etc in relation to the key light (main light on their faces). For those with no modelling experience, you might have to adjust them yourself. Just make sure you ask for permission before you do so.
After took a few shots, show the subject what you have taken so they have a better idea what you are trying to achieve and they will adjust accordingly.
See if you can see which is shot with an old smartphone (Honor Magic 6 Pro).