I use template
ST Tyneo for example If you have not an account Twitter yet, let create an account. In your Twitter account, chose Settings:

then chose Widget

Click to Create new

Chose your option: height, theme, link color then click Create widget

Copy all text in area above text: Copy and paste the code into the HTML of your site

In backend of Joomla, create a new module, type: Custom HTML, click to Toggle editor, paste all text you have just copy to the text area

fill other necessary parameter, then click Save. In frontend, you had module Twitter Widget like: