How to give a successful oral presentation!

Are you a student who has so many a lot of problems with lectures and presentations?
Do you think it is one they represent (/are) some of the most difficult moments in your life? Here, we want to make it easy with some tips and by discussing the factors that make for great public speaking!
Oral presentations are unavoidable in every student’s life! Although, However, they are not as difficult as they seem to be. Speaking in public or in front of a group of people is hard for most people; but practice can easily solve many of man’s problems. (in modern English it sounds a bit old-fashioned to refer to people as "man"/"men". You can simply use "many people's problems)
There is no point in being shy and losing your self confidence; it cannot help
you. or In other words, it makes everything even worse. If you prepare well, you
will be able to end it up successfully end up successful / be able to succeed. So, you should clarify some points before a
lecture or an oral presentation as well as:
• What do you want to say?
• Why do you want to say it?
• How do you want to say it?
• Who are is your audience or whom are you talking to?
These sample questions are very helpful and give you a general view; they
can organize your mind.
Your audiences are “listening” to you (why did you use inverted commas ("") for listening? Perhaps I misunderstand you). If you do not make yourself clear
about the topic clear you are going to talk about (/make clear what you are going to talk about), they probably will not get any the
point of your lecture. That’s why you need to be very transparent about
the subject at from the very beginning. Then, it is so important to give them a
reason to listen to you. They must be well-informed certain/confident that your oral
presentation will be informative and useful for them and it is, not a waste
of time! So, try to keep them interested in listening to you.
You can also use different ways and methods to present something such
as: slides, short movies, pictures, etc. Give your methods some variety so
that it will not be boring for your audience (/your audience will not be bored).
There is a very important question here: Whom are you talking to? If you
are talking to a group of classmates, your presentation definitely must be
different with to talking to doctors!
Finally, take a deep breath and trust yourself. You will be the best!

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Note that some of your linking words (So ; Then) are quite informal, and might be inappropriate to the tone of this piece. I left them in anyway :)

Really well done!