Of course it is possible there are several ways for this, I will post some:
using the B tag, for example your html text - > <h1> meu texto <b>aqui!</b></h1>
the text here! will be in bold
But as a good practice the ideal is to use css creating a class:
The "font-weight" property, which is the "bold".
Bold equates to our famous tag, to simply negritar a passage.
The syntax is:
font-weight: bold;
Bold is basically meant to highlight an excerpt from a text.
For example, to make the following sentence bold:
"CSS is a really important style language for creating websites."
We can use the following code snippet, directly in the tag:
"CSS is a language of style <span style="font-weight: bold">realmente</span>
important in creating websites."
Or creating a class in css and then assigning it to an element
.negrito {
font-weight: bold;
}
<span class='negrito'>oi</span>