Thinking of lLaser Weeding

I watched a short video introducing laser weeding as beinga technique used to kill weeds and unwanted vegetation on farms, which makes farmers do not buy herbicides again.

よかった！

また、
I watched a short video which introduced laser weeding as a technique used to kill weeds and unwanted vegetation on farms, which makes farmers not buy herbicides again.

This is a cutting-edge, new and innovative physicialal technique that is harmless to soil and crops.

「cutting-edge」と「new」という言葉は同じ意味なので、一つだけがいいです。

I hope this device can be developed or improved upon to kill flying mosquitoes one day.

蚊が飛ぶことができるから、「flying」という言葉は必要ありません。

I am dreaming for one day in the near future: first, I turn on but I want to use the laser mosquito control first to killing all the disgusting insects.

After that, I wcould go to bed without (using) any mosquito net in the summer.

Thinking ofabout laser Wweeding

Uppercase is used only when:
It is the start of a sentence
There's an acronym (like LOL, UNESCO) etc. although online many people will ignore this and write these abbreviations in lowercase.
The word is a proper noun (describing a particular object or person (examples: Paris (city), Meena (name), etc.)

I watched a short video introducing laser weeding as being used to kill weeds and unwanted vegetation on farms, which makes farmers do notthanks to which farmers don't have to buy herbicides again.

This is a cutting-edge, new and innovative physicialal technique that is harmless to soil and crops.

I am dream of it coming/happening one day in the near future: first, I'll turn on the laser mosquito control to killing all (of) the disgusting insects.

While the dream talks about something in the future, the action of dreaming is happening right now, so we generally use present. Another way to write the second sentence could be:
first, I turn on the laser mosquito control, killing all of the disgusting insects. (added a comma)

After that, I would be able to go to bed without any mosquito net in the summer.