Rule 3. Do not use double comparative adjectives or superlative adjectives.
Degree of comparison examples:
Incorrect – These mangoes are more tastier than those.
Correct – These mangoes are tastier than those.

Rule 4. Never use ‘more or most’ with adjectives that give absolute sense.
Degree of comparison example:
Incorrect – This track is more parallel to that one
Correct – This track is parallel and the other is not.