Video Maker

Hey! I am new to Insta. Searching for tutorial that can teach me how to post video on Instagram, how do i make a slideshow with music and how to combine two videos.

To my mind, you will never learn until you try everything and push each button.
I use instagram for a year and learnt lots of tips from https://wave.video. Website gave me answers to most common questions.

Is this an online program? What do you think can be used to download a video file and make some changes there? For example, change the extension and burn video to an ISO disc?

If you are looking for software for video files that will help you duplicate a file to disk and you don't want to pay for such a program, then I know where you can find a similar tool. I have been using the Free Make for several years. They are developers of simple but functional software that you can use for free. Usually, even a beginner doesn't have problems in order to figure out how to use this program, but if you suddenly run into some kind of problem, then in addition to their website you can use any video instructions from YouTube. This program has been used for many years by both beginners in video editing and professionals, so you will find many instructions and tips for this software on the Internet.