Answer and explanation:
Let's answer one by one.
"Upon entering the community, a prolific garden caught my attention."
The sentence above has a dangling modifier, which causes ambiguity. The modifier "upon entering the community" is unclear as to whom it refers. We can assume it refers to the speaker, but its proximity to "a prolific garden" makes it sound strange. The best way to correct it and remove the ambiguity would be by clarifying it: "As I entered the community, a prolific garden caught my attention."
"This mix of 35 glitter and shiny berries give your arrangements texture and offer a wintry take on traditional Christmas colors."
The subject of this sentence is "this mix of 35 glitter and shiny berries". But subjects have a word that is the most important one, called simple subject. That word is the one establishing the agreement with the verb. In the subject above, the most important word is "mix", which is a singular noun. Therefore, the verbs "give" and "offer" should agree with it. The correct sentence would be: "This mix of 35 glitter and shiny berries gives your arrangements texture and offers a wintry take on traditional Christmas colors."
"This sleek and durable multitool includes a bottle opener, screw driver, ruler, standard blade, and serrated blade."
There is an error in parallelism in this sentence. We are listing a sequence of tools included in the multitool. The first item listed consists of article + noun, but the others are missing the article. When we list things in a sentence, it is advisable to keep parallel structures in mind to make reading easier and consistent. The correct sentence would be: "This sleek and durable multitool includes a bottle opener, a screw driver, a ruler, a standard blade, and a serrated blade."
