How to comment on adobe pdf document by using annotation commenting tool

how to comment on adobe pdf document or pdf file by using annotation commenting tool.
To add comment on a pdf file or pdf document, under the comment option there is annotations tool given which has many options for placing different types of comments. Different options are:
To add bubble comment on pdf
add text in between on pdf
replace and add text on pdf
strikethrough the text to cut on pdf
underline the text on pdf
highlight the text on pdf
attach file on pdf
add audio on pdf

Book: How to Do Everything Adobe Acrobat X
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Adobe Acrobat X Classroom in a Book : amazon.in/Adobe-Acrobat-X-Classroom-Book/dp/032…


watch: "Normality and Gram Equivalent Weight"
youtube.com/watch?v=oP8MbooaKy4

"what is prescription, Parts of prescription, objective of prescription-dispensing pharmacy"
youtube.com/watch?v=Twb7UOM1jrY

acid base concepts-Arrhenius , Bronsted- Lowry and Lewis concept- youtu.be/bUtnDRl-Gxo

ph scale- youtu.be/tZTgwSKqSIU

Units of measurements- youtu.be/3OextNHQjmQ

Pharmaceutical packaging and labelling- introduction--
youtu.be/Z6ROwQvsyyY

How to prepare and standardize 0.1 N Sodium Hydroxide(NaOH) Solution in Hindi -Part 1
youtu.be/ctAT6qVy5cQ
HOW TO PREPARE 1N AND 0.1 N SULPHURIC ACID
youtu.be/0dHf4bpZKwc