A plumber understands wrenches. A seamstress knows what to do with a thimble. A dogcatcher must use a net. And a writer should absolutely know what words require capitalization and which do not.
When you write in English, your readers have expectations
What's wrong here?
When I am Angry at my neighbor, I walk by without Speaking to Him.
Correct: None of the capitalized words are proper nouns. In English, we capitalize names of specific persons, places, or things. Like Paris, President Lincoln, or my name. Or yours. We do not capitalize common nouns like bread, city, east, summer, or police. They're generic. Everyone who has ever studied English, from first grade on up, learns this.
What's wrong here?
I'm telling you, I WON'T take it anymore.
You're right: Among professional and practiced writers, we strive for a consistent reader experience. If you're going to capitalize words for emphasis, don't use italics for some, caps for others, and bold for a few more. Pick one. Italics is the preferred because it doesn't make the reader stop and figure out why you did what you did with a given word.
What's wrong here?
It's Summer. Tomorrow is the first day of Spring. I hate Winter.
Now you're catching on. The names of seasons are generally not capitalized since they aren't proper nouns.
How about this one?
How I learned To Love the Bomb
It's a title. For that reason, especially on Medium, typically you want to use title case. Not a simple process since there are many kinds of title case, as in the AMA Manual of Style, the AP Stylebook, the APA Publication Manual, the Bluebook, the Chicago Manual of Style, the MLA Handbook, the New York Times Manual of Style and Usage, and the Wikipedia Manual of Style. Besides those, every publication on Medium has its own rules. Now what?
Here's a safe method that won't get your writing rejected or made fun of.
Capitalize the first word of any title. Capitalize any form of the verb "to be"--like is, was, am, are, will be, be, and so forth.
Capitalize all verbs, nouns, pronouns, the principal words, all words of four letters or more, spelled-out numbers, and the first word of a hyphenated word like Net-gain.
Do not capitalize the word to in infinitives or any article (Ex: an, a, the), any conjunctions (Examples: and, or, but, if, nor, but, yet, so), and prepositions of four letters or fewer (Ex: as, in, of, on, to, for, from, into, like, over, with, upon).
Make a note that some platforms and publications require subheadlines and subsection titles to be formatted in sentence case, not title case. No period at the end of subtitles or titles.
Why does this matter?
Readers are fickle. I'm assuming you publish stories on Medium to attract and keep readers. When most of us read, we allow ourselves to become immersed in the writing; at least we hope that will be the case. Good writing keeps us engaged.
We learn early on to expect certain conventions in printed or electronic text, even if we can't rattle off those grammar and syntax rules like the words to 99 Bottles of Beer. Our brain makes us stop and withdraw our attention when something looks different from what we expect.
As a reader, I will briefly wonder why you capitalized half the nouns in your paragraph, for example. Then I have to reestablish the mood to keep reading. Do it to me too often, and I will move on to another story. Scatter silly punctuation, spacing, or misused words into the mix, and I'm gone.
It isn't that tough to use these conventions. Heighten your awareness when you're reading and see what stops you. Read your prose out loud and see if it feels graceful to you.
But what about my personal freedom?
My friend, if you're a skilled surgeon, you don't start your path to success by using a hacksaw to perform a tonsillectomy. You learn your tools, hone your technique, and make prudent, purposeful decisions.
If you think of yourself as a skilled writer, you can break rules and conventions purposefully to give readers an engaging, satisfying, and unique experience. I might type P A Y A T T E N T I O N if I really want to smack you right between the eyes. You'll tolerate it because it's clear that I had a goal in mind. If I type p A Y A te n TiON, I'll just annoy the hell out of you. You won't feel satisfied, and you may decide I had a little too much beverage with my lunch.
Here's a gift: have a look at this easy, free title case converter.
https://titlecaseconverter.com/
It sure makes sense to know the rules before you decide to flaunt them.
I have been doing this for a long time and still get stuck sometimes. The app you provide is one of those I use for such occasions. Sometimes I will use Microsoft copilot to capitalize properly...but it is not always effective.
Thanks for the gift. I will play with this later! (It's taking every inch of strength in my scrolling finger not to go to everything I've ever written to check my titles.)