Kacper777 As per your FIRST questions
I don't want to use this option because you can't do whatever you want with a virtual machine. For example, you can't play games or do graphics related things. There are some other limitations also
I dont think there are much 3D heavey graphics Games or heavy graphics designing softwares for Linux or ubuntu
common things to be kept in mind are virtualisation is not a full blown OS as its never a native piece of software working on a machine its always semi native or virtual as the name suggests, so it’s better to go for a live CD or DVD or install on your HDD… and dual boot them. Vmware is good for just testing purposes, if you really need to dive deep in then it is necessary to install or say dual boot Linux into a separate partition say ext4 or zfs with swap files and all.
still you can see following links and discussions on limitations and problems of ubuntu in virtual machine. The only problems come with virtualisations with devices and peripheral devices like printers dont work Most likely, printers, graphics tablets and other peripherals won't work at all.
Kacper777 As per your SECOND questions
Sometimes Windows updates changes loader and this may cause that I will have to repair and reinstall a lot of things in order to be able to use Linux. Another issue is related to time management. It also sometimes creates problems.
Every problems have solutions. NO PAINS NO GAINS. so tricks and see links below to how to solve the problems
sharing some links to understand the problem and details
TIME MANAGEMENT LINKS
GUIDES FOR DUAL BOOTINGS
Kacper777 As per your THIRD questions
Where I can hold my data? I always have a system on one disk and the data on the other. Because the system may crash and I don't want to lose my data.
You can save data on a partition of second or first disk you wish and create a partition for backing up image or shadow or mirror of first disk. Keep OS in one disk. Before installing linux its advisable to create a image file of your HDD and data disk.
again sharing links for data corruption as linux is must stable but in once in 1000 there may be chance for corruption due to different file system support of linux and windows.
Many videos and users say there MAY be chance they dont say there should be 100% chance of corruption Still it always better to create an backup image or cloud backup of your data for safety
Corruption Crashes solutions tricks and advice's in other discussions you can read which my be helpful for your knowledge
Hard drive corruption on a dual-boot system
Kacper777 As per your FOURTH ADVICE AND SUGGESTION REQUEST questions
So what do you recommend for me? Is it a good solution to install two systems on two disks?
firstly its advisable better to keep OS in 1 disk and windows 10 in one partition and linux on other partition and data on other disk for safety and corruption and file system protections which will protect your data and from any hard
secondly its advisable if you have space then create 2 partitions in 1 partition keep the data and second partitions keep the IMAGE file ie. backup of both bootable system HDD and data HDD for your safety ...and if possible keep those images copies in DVD drive or Blue ray disk or on cloud for safety of any HDD or system boot failure
As per my thoughts experience and knowledge, I am to novice and new to linux and was finding solution to learn linux I have not used Ubuntu and want to install on my PC and laptop and my question was same and i founded a best solution for my self may be it suits you to.
The solution i founded is to install Linux on Flash pen drive have not tried and dont know about its pros or cons and problems but think it best suits your problems.
As it will benefit you in following ways :-
No need To install Linux in Dual boot with current OS in your first HDD where your windows 10 is installed
It will also not effect your second HDD with data saved
It will also not effect you to play games in windows
It will also not corrupt any file system or booting files or boot menus GRUB UEFI or any other files.
It will also not take any space in your laptop or HDD.
You can also boot in VM and directly from USB flash drive laptop also
You can move with your flash pen drive at any place other Desktop or Laptop and carry your linux OS in your pocket at any place
Install Ubuntu or linux OS in Flash drive or USB pen drive or External USB HDD SSD and whenever wherever needed Just boot from flash drive and this will not effect your Windows 10 OS or attach or detach your
Now How to install Linux Ubuntu in Flash drive or pen drive or External HDD is a big topic so below is the VIDEOS and link i am sharing it below see it may help you
Hope above tips and suggestions and links helped you if any of them worked and suited you do tell me in comments which one worked for you for my knowledge and if not suited or helped you then feel free to ask any doubts for further clarifications and if worked then DONT FORGET to vote and accept the answer