The 2026 Grammar Guide offers to you 100 helpful lessons which you should keep before your mind's eyes. You can find them all at the link EnglishGrammar.org.
I will try to give to you each day a lesson and hope you can visit and learn more from that link and their offers.
1. According to
• Incorrect: According to me, she should have resigned earlier.
• Correct: In my opinion, she should have resigned earlier.
We do not give our own opinions with according to.
2. Across and through
The difference between across and through is similar to the difference between on and in.
We use through to talk about movement in three dimensional spaces with things on all sides.
• We walked across the field. (= We were on the field.)
• We walked through the wood. (= We were in the wood.)