If you plan to insert a simple table into WordPress, you can use the Table Block in the block editor (also called the Gutenberg editor), but it won't look like one of the fancy tables you can create using presentation software tools. If you want more complex tables than what TablePress allows you to make, you can use a premium plugin, like WPDataTables. Another option is to create the table using a free online HTML editor (e.g. https://html-online.com/editor), then copy all of the HTML code and paste it into your WordPress editor's Text file.