Why Is There Not, As far As I Know, a Wireless Mouse with a USB C Port for a Samsung Chromebook Plus

Because you are not supposed to use USB adapters anymore, there is Bluetooth integrated into your Chromebook and hundreds of Bluetooth mouse models to choose from

1. Can DisplayPort over USB-C communicate successfully with an HDMI Type A port?

That sounds like you've set the Chromebook to "Extend desktop" mode instead of the mirroring mode

2. Safe to use USB-C Charger (adapter) for Macbook Air 2013?

That will not work on MBA 2013,It has only one port where you can charge it (the magsafe plug).You will need new power charger for your MB Air 2013.About USB...till the USB/C came out the USB were only data ports (with 5 Volt) and could not handle the power needed to charge a Mac. To charge your 2013 MacBook Air you need 16-18 Volts input and correct 5 pins plug

3. How to connect a USB-C-based MacBook to a Thunderbolt display?

If your display is Thunderbolt, it wo not run even if you connect it properly to a mini-DisplayPort signal.If you have a DisplayPort display, you can get things to work as follows:You need three items to make this work. This only lets the display itself work and you would need to connect USB to gain speakers and camera functions.

4. Can I charge a 2017 MacBook Pro with a third-party USB C power adaptor?

I have a 13' MacBook Pro which has a 61W Power Adapter supplied by default. For this I have bought an Anker 30W rated charger with which I never ever had any issues charging the notebook (even when doing CPU intensive stuff), and I also have a cheap 15W (5Vx3A) charger in my car as well, which still slightly charges the notebook, unless I am doing something CPU intensive. I sometimes also use my mobile phone charger rated 10W (5Vx2A) as well to charge my notebook, in that case it always discharges, but at a much slower rate than if I had not plugged it in at all. It can still charge the notebook if I leave it on overnight though.Although your notebook does have a higher power consumption by default, as it's the 15' variant, based on my experience with the smaller version I do not imagine using it with only a 60W charger will cause too many issues, even when you are really trying to push the computer to the limits. However please note that the one in your post (which is exactly the same as I have) is actually only 30W on the USB-C port - the other 30W is shared on the 4 plain USB ports. You might try to check the values in the About your Mac section as Buscar said to see your notebook's power consumption, especially if you do heavy CPU/GPU intensive tasks.Note: I've been using this setup for more than a year now without seeing any performance degradation of the batteries

5. Connect dual Monitors to a single USB-C Port

The 2016 Macbook does not support more than 1 external display. From Everymac.com:However, that being said, I have seen folks add a second screen (a second projector) using a USB to video adapter. I have never had the need or opportunity to try this myself, so YMMV.

6. Should I buy USB-C Flash Drive or portable SSD to keep my documents for future?

If you are on a tight budget, I would use clay tablets

7. iPad 4th not recognised when connected via USB-C Apple Digital AV Multiport Adapter on Catalia

The Apple Multi-port adapter only provides power via the usb-c out connection.You could use the older USB-A port to get USB 3 speeds if needed THOUGH early iPads top out at USB 2 on the Lightning adapter.Full details of the connector are on the Apple site here.

8. Howto repair broken USB-C Power Delivery cable?

USB C is a dense pinout connector and Power Delivery requires more than just the "standard" USB 2.0 pins of Data, Data-, 5V and GND.From EE: How does a USB C port provide the power to charge laptops? you can see that the CC1/CC2 pins beside the D/D- pins are used to communicate for USB PD.This is the main reason why Power Delivery does not work for Type A ports, because they lack the communications lines necessary for negotiation and as a result revert to the "old" power level being selected by specific resistances across the USB data lines trick. You need to find out if these pins are wired up in your new connector, if they are not then Power Delivery using that connector will be impossible