The view from the window

"Window" needs an article ("a" or "the") because it is singular and countable. If you mean a specific window, use "the." If you mean an undefined or arbitrary window, use "a".

Today, I am chooseing a topic that doesn't need my deep thoughts.

The verb "choose" should be in the -ing form because it is happening at the exact moment of writing.

I feel strange when I look onat the picture.

In English, looking at something is usually associated with direction, which uses the preposition "at". It is also acceptable to say "I look upon the picture," but this is more formal and is usually only found in literature.

Unfortunately, I cannot tell you about all the details, because I don't have enough knowledges.

"Details" is plural, countable, and specific, so it needs "the".
The plural of "knowledge" is "knowledge," unless you are talking about multiple specific subjects that you have knowledge of.

Even these sentences I wrote with some helping.

The verb "help" has two noun forms. In this case, because you are talking about a general sense of receiving assistance from someone, "help" is used. The gerund form "helping" is only used when talking about actions performed by someone or something. For example, "helping people is fun," or "I wrote with someone helping me."

The view from my window

Today, I choose a topic that doesn't need myrequire deep thoughts.

I just want to talk about twhat I see in outside.

I feel strange when I look onat the picture.

Unfortunately, I cannot tell you about all of the details, because I don't have enough knowledges.

Even these sentences I wrote with are somehow helping.

The view from my window

Another alternative is "the window." The word "window" by itself is not enough here.

Today, I choose topic that doesn't need my deep thoughts.

The word "choose" isn't exactly wrong, but here it makes more sense to use the past tense.

I just want to talk about that I see in outside.

I feel strange when I look onat the picturscene.

Unfortunately, I cannot tell you about all details, because I don't have enough knowledges.

Even these sentences I wrote with some helping.