For video editing,

There is plenty of apps/software are available in the market. You have to choose a video editor based on your needs. That means, If you want to create more professional videos like short films, corporate videos, interviews, etc., You should buy a professional video editor. Many professionals would suggest to you “Adobe Premier pro“. 

to create professional videos. Even with this software, you can create short movies.

I trust you are looking for an easy to edit software for your YouTube channel with basic features such as trimming, joining clips, attach audio, titles, transitions, and some basic effects too. For such beginner video editing, I would strongly recommend “Wondershare Filmora“. this is the most popular YouTube video editing software at present.

Both the software are paid software and the best in their niche. You will be feeling both software worth for the money if you buy for your video projects. I suggest exploring the features of both software before buying.

In another way, 

If you are a complete beginner in the video editing field, I suggest you start with free video editing software. Surprisingly I found a great free video editor online for you.

That is OpenShot Video Editor. With this open-source software, you can trim, add multi-track videos, audios, titles, transitions, etc. If you want to create simple videos for your YouTube videos, this tool is a great selection. Just download the software here,

and start editing your videos without spending a single penny.

For screen recording,

As video editors, there are many screen recording software available. I personally recommend using Camtasia or Bandicam for recording HD screen. I am using these screen recorders for a decade and I feel comfortable with their user interface and performance in recording my laptop screen.