Online posts that are nothing more than lists were popular for a while. Then they became a cliché. You don’t see them so much now.
There’s nothing wrong with writing lists – especially when publishing online – so long as you don’t overdo it.
If the list items are short, you can use bullet points. Or, if the order is important, choose numbered bullets.
Both make text easy to scan and read quickly.
Another, more elegant, approach is to write out your list using a variation on the following theme:
First, something happened. Second, something else. Next, we used a little elegant variation to make things more interesting. Then, we did this. Last, we finished up.
Ideally a list written this way should have only a few points. Keep it to five or six, maybe seven at most.
When writing numbers this way you should spell out the words from first to ninth* then write 10th, 15th, hundredth. Let’s hope you never get as far as ninth.
Some people use firstly, secondly, thirdly and so on. While strictly speaking both approaches are grammatically correct, adding -ly is old-fashioned and unnecessarily fussy.
What’s more, you’ll end up looking silly if you want to deal with lots of items and reach eleventhly or even millionthly.
So, stick with the simpler format.
* or perhaps tenth. This depends on your taste or if you have one, your house style guide, but remember to stay consistent.