You're commenting on a news story about the President of your country. A lot of the other commenters are saying bad things about the President, but you still like him and think that he can accomplish good things. You write:
Everybody seems to be critical of the President these days, but I still believe in him.
To "be critical of" someone means to talk about their faults and the things that they do wrong.
When I spoke with the Director, she was mostly critical of the department and the job we were doing.
"These days" means "recently". But "recently" is used to talk about things that have happened over the last few weeks or months. "These days" is a longer time period, usually from the last 6 months to the last 20-30 years. You use "these days" to talk about major changes in your life or in society.
I don't watch much TV these days.
Kids these days don't even remember what life was like before mobile phones and the Internet.
There are a few meanings of the phrase "believe in ___". One meaning of "believe in ___" is to believe that something exists, or to believe that something is true. For example:
Do you believe in ghosts?
Not all people who believe in the Bible think that the story of Eden is literally true.
But another type of "believe in" is to believe that someone will be able to succeed. For example, parents tell their kids this to encourage them:
I believe in you.
A reader has asked how "believe in (someone)" is different than "trust (someone)". One difference is that when you "trust" someone, it means that you think that they'll:
- do the right thing
- not mess up
- not do something to hurt you (lying, stealing, cheating, etc.)
But when you "believe in" someone, you think that they'll accomplish something great:
I grew up never taking risks because I never felt like my parents believed in me.
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