In this forum, I learned that everyone had adversities in the past, which reminds me to be kinder withto others. In this forum, I learned that everyone had adversities in the past, which reminds me to be kinder to others.

In this forum, I learned that everyone has experienced adversities in past, which reminds me to be kinder with others. In this forum, I learned that everyone has experienced adversities, which reminds me to be kinder with others.

He has/she has /they have + past participle No need to say in the past you’re defining it with the grammatical tense ^

In this forum, I learned that everyone has had adversities in the past, which reminds me to be kinder with others. In this forum, I learned that everyone has had adversities in the past, which reminds me to be kinder with others.

いいですね。

I also learned new ways to goet over their fears and challenges. I also learned new ways to get over their fears and challenges.

I also learned new ways to goet over their fears and challenges by reading about their own triumphs/successes. I also learned new ways to get over fears and challenges by reading about their own triumphs/successes.

I also learned new ways to goet over their fears and challenges. I also learned new ways to get over their fears and challenges.

わー、すごい！