how can I make the gradient text?
You can use the text effects already supplied in Wix Editor.
https://support.wix.com/en/article/adding-text-effects
You could try doing it yourself through the text html option, however it probably won’t be doable with the already set HTML tags and CSS styles.
Otherwise, you will either have to write your own html/css code for it or add it simply as an image that is already had the gradient effect applied to it through using photoshop, illustrator etc, etc.
https://www.w3schools.com/css/css3_gradients.asp
https://css-tricks.com/snippets/css/gradient-text/
https://cssgradient.io/blog/css-gradient-text/
https://codepen.io/leocampos/pen/pPwwNR
https://codepen.io/shshaw/pen/YpERQQ
It’s very easy as one -two-three… If you need my help please contact - https://www.etsy.com/shop/GraphicsSt
Create a gradient overlay in Adobe Photoshop(or Illustrator ) then add your text on a page and then add the gradient overlay above… Done !!!
Yep easy peasy, although I think that this forum poster was hoping that it could all be done within the confines of Wix and they wouldn’t have to resort to doing it all themselves. 
Hi GivemeWhisky ! Can you help me…?
https://www.wix.com/corvid/forum/community-discussion/dynamic-category-page-with-store-product-dataset?utm_source=email_mkt
It can be done by “pure Wix” by using code to draw an SVG gradient text . But I don’t think it’s easier.
That is true J.D., however they would still have to learn or find out the code to do it. 
Thank you for this detailed gradient tutorial. It can be great to complement and improve the quality of my presentations. I often deal with this, and I try to be aware of all the possibilities so that I prepare as well as possible. And this source helps me with this https://masterbundles.com/how-to-wrap-text-in-google-slides/ Thanks to it, I finally figured out how to wrap text in google slides.