Questions & Answers about Ciò è evidente, ma non evito mai il problema.
Could I use quello instead of Ciò to say "That is evident"?
Yes, you can. Ciò and quello can both mean "that" when referring to an abstract idea, a previous statement, or a whole situation. Ciò is a bit more formal and is exclusively used for abstract concepts, whereas quello is very common in everyday speech and can point to both concepts and physical objects.
If Ciò is an abstract concept, what gender is it? Does the adjective evidente have to match it?
Ciò is invariable, meaning it doesn't change form, but grammatically it is treated as masculine singular. Because evidente ends in -e, it is the same for both masculine and feminine nouns anyway. However, if you used an adjective that changes, you would use the masculine -o ending (for example, Ciò è chiaro).
Why do we need both non and mai to say "never"?
Italian frequently uses double negatives. When a negative word like mai (never) comes after the verb, you must put non before the verb. So "I never avoid" becomes non evito mai. You could technically drop the non if you put mai before the verb (mai evito il problema), but placing it after the verb with non is the standard, natural way to say it.
Why is it il problema when the word ends in ?