Before you practice, it is a good idea to be aware of common mistakes.
Some English learners mix "as" comparisons with other kinds of comparisons. For example, they might say, "The pasta is as tastier as the rice." We do not use -er adjectives like "tastier" in "as" comparisons.
Another common mistake is using the word "less" "more" or "than." For instance, these are incorrect: "The pasta is less tasty as the rice" or "The pasta is not as tasty than the rice."
If you make these mistakes, do not worry. Most people will still understand your meaning. And, with time and practice, as...as comparisons will get easier!