Added more resources and fixed syntax

Signed-off-by: anneiric <[email protected]>

README.md

@@ -11,6 +11,7 @@ Free Learning Resources related to Web-Development 🔥❤
 - [CS50X](https://cs50.harvard.edu/x/2020/)
 - [CS50 Youtube channel harvard all playlist included ](https://www.youtube.com/channel/UCcabW7890RKJzL968QWEykA)
 - [CS50 short introductory tutorials on JS/algo/html/AJAX all building blocks covered playlist ](https://www.youtube.com/playlist?list=PLhQjrBD2T381k8ul4WQ8SQ165XqY149WW)\
+- [A free guide to learn HTML and CSS](https://marksheet.io/)
 
 # Other Web-dev essential resources
 
@@ -22,7 +23,7 @@ Free Learning Resources related to Web-Development 🔥❤
 
 - [HarvardX CS50: An introduction to the intellectual enterprises of computer science and the art of programming.](https://www.edx.org/course/cs50s-introduction-to-computer-science)
 
-- For More tutorials and resources you can youtube or google this are some i find you can contribute more .
+- For more tutorials and resources you can look up more and contribute to this. 
 
 # Reactjs