as I remembered from school, the "point one" is where the retina is in order to have a good vision in our eyes.
There's probably confusion between you and the supervisor w.r.t. the terms you're using, and your explanation above is a bit unclear anyway (I don't mean any disrespect, I'm just stating a fact the way I see it).
If your drawing represents the structure of the human eye, then yes, point 1 is where the retina is. The lens creates a so-called real image that gets projected on the retina, just like a digital camera projecting the image on a sensor.
However, if your drawing represents a lens on your bench, with the source very far away to the left, and you put your eye in point 1, then you won't see much. You need to put a piece of paper in point 1, then the image will form on it - again, just like at the movies. This is because the image is real, not virtual - so therefore you can't put your eye in its middle and expect to see it. That would be like going at the movies and standing with your back against the silver screen - do you think you'll see the movie? Of course not.
I am trying to figure out where is the focal point and where is the image.
For a convergent lens, talking about real images, those that you can see if you insert a piece of paper:
If the source is very very far away (I'm talking a few hundred meters or more), the image is formed exactly at the focal point on the other side of the lens. The location of the image and the location of the focal point coincide.
If the source starts moving closer to the lens, the image starts to form further away - the image is moving away from the lens as the source is moving closer in.
If the distance between source and lens is 2x bigger than the focal length, then the image is formed at the same distance (2x focal length), on the other side of the lens.
If the source is at exactly 1x the focal length (the source is in the focal point), then the image is formed very very far away on the other side.
If the source moves closer to the lens than the focal length, then no real image is formed.
Look again at the diagram I posted on the page of your previous question a few days ago.
The main purpose I am asking this because I want to get as much light as possible to a small area, and me and him were trying to figure out which point has the maximum light.
In theory, that point is where the real image of the source is formed. See above.
In practice, because the source is not a point of light, and because lenses are not perfect, there might be smaller variations. But don't expect to find the max light point too far away from where you can clearly see an image of the source if you insert a piece of paper.
So it's really easy. Insert a piece of paper, move it back and forth until you get a clear image, and start from there.