Every time you think of a subject you want to write about your mind will start sending your thoughts in a number of directions.
To not get lost in all of the ideas you are getting, begin to jot down just one thought as it comes up for you, then set that paper aside.
It will help you clear that data so you can capture another thought and jot it down and again set it aside.
Repeat this process as long as you are having information input from your mind on the topic you have chosen to write about or until you have enough information to put together a written account of this data.
You might want to gather the information that seems like it should go together in an article or story and set any related thoughts that are not specific to this group aside to put together in another article or story.
Think about this as if you are separating apples and oranges into bowls.
Yes, both of these are fruit, just like your related thoughts about your topic, but they have different characteristics, again just like your thoughts about your information for your article or story.
Grouping them by thinking of them as apples or oranges will give you totally different perspectives and approaches to writing and quickly increase your ability to write.
Your writing will improve immediately when the related thoughts are in the same article or story because your focus will be clearer about what you are sharing with others.
That ability to offer clarity about your topic will be appreciated by your reader also and many will want to read other articles or stories that you have written.
As an author, when you get to the point quickly and present your information precisely and clearly it is such a joy to both you and your reader.
You will also find your level of satisfaction about what you have written will increase.