Update welcome.md

Author: SecureFromScratch

hacking/devtools/welcome.md

@@ -12,6 +12,17 @@ Refer to juice shop repo for installation: [Juice Shop Repo](https://github.com/
 - Manipulate authentication tokens stored on the client to change privileges or view protected content.
 - XSS - Find a place where user input is reflected into the DOM without sanitization and achieve JS execution in the page context.
 
+## General Hints
+- View source
+- Check the cookies
+- Inspect the local stroage
+- Check the source control
+- Check the console
+- Check the netwrok tab
+- Debug (in the browser)
+- Use the Pretty Print ({}) function in Sources to make minified JS readable.
+
+
 # Solutions 
 In the next pages will show the solution one after anohter