There is, unfortunately, a trap that some people may fall into when practicing mindfulness meditation.
In the context of selecting a point of focus that anchors you into the present, there is that teensy possibility that someone just starting out with meditation might focus without equanimity.
Equanimity is the ability to maintain balance and a sense of calm in both good and bad situations. It is the acceptance that impermanence and suffering are a part of life, and it is the state of allowing all feelings to pass through you, observing them without judgement or expectations brought on by previous experiences.

Allowing emotions in when you’re trying to stay calm and collected might seem a little counter-intuitive, but in fact, I consider it to be to goal of mindfulness meditation. That’s because the most important time to maintain a sense of inner peace is exactly when the proverbial sh!t hits the proverbial fan. Mindfulness meditation provides us with a safe space within which to practice just that.
The tendency, however, is to try to keep difficult emotions out. I myself encounter a lot of resistance when doing guided meditations that focus on bringing up uncomfortable thoughts, particularly in the evening, when I’m most susceptible to anything that might perturb my sleep.
However, not allowing those thoughts in can set up a pattern of avoidance, depriving us of the opportunity to learn to deal with them. And this avoidance can imbue difficult thoughts with even more power, as if they become the boogeyman lurking behind a door that we’re terrified to open. That’s not a good thing.
So how do we get around this?
Pick a good time to explore the stickier side of things; I would caution against the evening, when, as I mentioned above, bringing up tough feelings can agitate you and make it more difficult to fall asleep. Keep the environment quiet, comforting and safe, with gentle music in the background, if that suits you. I like mid-morning time and natural light, with a cup of tea or cacao or anything else that feels soothing.
Choose your anchor: your breath, a bodily sensation like tingling in your hands, a constant sound in the the background…even lofi music from YouTube.
If you feel too drifty, keep your eyes open to help ground you. Perhaps focus them on an object that brings you peace, such as the photograph of a loved one or an image of a peaceful place.

Breathe deeply and pay attention to gripping or tightness in your body, especially forehead, jaw, neck, shoulders and belly. Consciously release any areas that seem to clench as you go along.
And then allow whatever comes up to come up. Observe them…and then let them go. No need to analyze or justify. Imagine that you’re made of Teflon and those uncomfortable images slide off you.
If needed, sit further away from them. When the intensity gets too high, you might need space, so imagine that they are flowing past as if you’re on the bank of a river and they are the leaves that float by on the surface of the water. They come and they go and you breathe deeply through it all.
As you practice, maintain your focus the best that you can. The point of your focus is not the thoughts, it’s the breath or whatever other anchor you might have chosen. This way, the thoughts move independently and subside as smoothly as they appeared. If you find yourself getting stuck, return to your anchor and remind yourself that in this moment, you are safe.
IMPORTANT: If your thoughts are tied to trauma or the intensity seems unbearable, please seek out the help of someone professionally qualified to help you deal with them. Mindfulness meditation is a wonderful tool, but sometimes it’s not enough.