"a good leader needs to have their head screwed on." Please help me the meaning of the word “screwed on” in that sentence . TIA

What does the word Suicide at the bottom of the picture mean ? TIA

What’s the meaning of the word in red circle? I’ve looked up in some dictionaries but haven’t got it.

Why does the highlight part is There’s a few things instead of There are a few things?

Being in a farming family, my parents always make me work hard. They tell me that I just have whatever I want when I spend more time, labor on it. And if I am not satisfied with my achievement, at least I do a healthy life. There is no time for bad thinking when I’m busy with working.

I’m into bilingual joking book. I always head to something that’s funny. After a day long of work I would love to have a great time with laughter. And the other reason is those books make me more confident while communicating, make people feel happier whenever they talk to me. I’m right now looking for some things on internet and I don’t have to pay anything for reading them. Sometimes I got a book from my friends or from bookstore. Bilingual book helps me to open my vocabulary bank even though it’s still small. Here’s the book I’m reading. I enjoy it a lot. Below is one of the funny parts of this book.

Mình Love is to die a little inside Since we love but not sure what to receive Give a bunch but is a recipient of non They betray, or disinterest, don't they?

First of all, it’s one of the subjects at secondary school. But at that time there was only textbook, no audio, no video, no speaking English people. Even the textbook was also limited. That’s why almost students could not speak a word after learning English in a long period of time. Until I graduated and got a job that’s needed this language I forced myself to learn it again so that I could work well. Afterward I move to another city then I left that job and look for a new one which is not required English. But I sometimes still engage with English stuffs like movies, music, podcasts for relaxing