Shapefile points, individual editing

I am very new to QGIS and have run into a problem dealing with shapefiles.

Recently, I went into the field with an app for smartphones called ‘SW Maps’ that I used to create some basic layers for lines and points. Under the ‘point layer’ I have three different types of points (I know I should have separated them when I created the layers).

Now that I’m home, in front of the computer, I exported the shapefiles and loaded the data into QGIS.
Everything looks good, except for that I want to change the symbols and colors of the points so I can categorize them according to what they are.

The problem is that when I change the attributes to one point, it changes all the rest. I am not sure how to split(?) each individual point so I can edit them accordingly without having to create a duplicate, editing the color and symbol, making sure all the attributes copied over, and then deleting unwanted duplicates.

Does anyone know the best way to work around this? Or a good tutorial video on this type of editing? Or will I have to duplicate and edit individually?