Coming from Windows - necessary to change bootloader or any other changes? RAM?

Hello I am a newby to the Linux system and specially to Manjaro, IT IS FANTASTIC, THANKS GUYS !!!
I never had big problems installing Linux and deleteing Windows, even as newbe-newbe. I change some things on my EFI bootloader and then installed many different Linux, now decided to STAY with Manjaro (after many time with POP but having problems some times) Here is my INXI, and:

  1. Should I change something essential?
  2. If I would like to put more power with putting 16gbits more RAM, would this be enough and do I have to buy the same that are installed or can I buy 3200 Mhz e.g. and how to I have to go on after opening the tower? Thanks a lot for any help !!
Kernel: 6.1.49-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 13.2.1
    clocksource: tsc available: hpet,acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz-6.1-x86_64
    root=UUID=0234c450-8267-41f9-8680-070eb18ba8e9 rw quiet splash apparmor=1
    security=apparmor udev.log_priority=3
  Desktop: GNOME v: 44.4 tk: GTK v: 3.24.38 wm: gnome-shell dm: GDM v: 44.1
    Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Desktop System: Acer product: Nitro N50-110 v: 1.0 serial: <filter>
    Chassis: type: 3 serial: N/A
  Mobo: Acer model: Nitro N50-110 v: 1.0 serial: <filter>
    UEFI: American Megatrends v: R01-A1 date: 10/09/2019
Battery:
  Device-1: hidpp_battery_0 model: Logitech Wireless Mouse MX Master 3
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes
    status: discharging
  Device-2: hidpp_battery_1 model: Logitech MX Keys Wireless Keyboard
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes
    status: discharging
Memory:
  System RAM: total: 16 GiB available: 15.54 GiB used: 2.46 GiB (15.8%)
  Array-1: capacity: 64 GiB slots: 4 modules: 2 EC: None
    max-module-size: 16 GiB note: est.
  Device-1: DIMM4 type: no module installed
  Device-2: DIMM2 type: DDR4 detail: synchronous unbuffered (unregistered)
    size: 8 GiB speed: 2667 MT/s volts: curr: 1.2 min: 1.2 max: 1.2 width (bits):
    data: 64 total: 64 manufacturer: Samsung part-no: M378A1K43DB2-CTD
    serial: <filter>
  Device-3: DIMM3 type: no module installed
  Device-4: DIMM1 type: DDR4 detail: synchronous unbuffered (unregistered)
    size: 8 GiB speed: 2667 MT/s volts: curr: 1.2 min: 1.2 max: 1.2 width (bits):
    data: 64 total: 64 manufacturer: Samsung part-no: M378A1K43DB2-CTD
    serial: <filter>
CPU:
  Info: model: AMD Ryzen 7 3700X socket: AM4 bits: 64 type: MT MCP arch: Zen 2
    gen: 3 level: v3 note: check built: 2020-22 process: TSMC n7 (7nm)
    family: 0x17 (23) model-id: 0x71 (113) stepping: 0 microcode: 0x8701013
  Topology: cpus: 1x cores: 8 tpc: 2 threads: 16 smt: enabled cache:
    L1: 512 KiB desc: d-8x32 KiB; i-8x32 KiB L2: 4 MiB desc: 8x512 KiB L3: 32 MiB
    desc: 2x16 MiB
  Speed (MHz): avg: 2375 high: 3600 min/max: 2200/4426 boost: enabled
    base/boost: 3600/4400 scaling: driver: acpi-cpufreq governor: schedutil
    volts: 1.1 V ext-clock: 100 MHz cores: 1: 3600 2: 3600 3: 2200 4: 2200
    5: 2200 6: 2200 7: 2200 8: 2200 9: 2200 10: 2200 11: 2200 12: 2200 13: 2200
    14: 2200 15: 2200 16: 2200 bogomips: 115026

Moderator edit to improve formatting

What problems? Describe them, please?

Please use the proper code tag for formatting. And look through the how-to tutorials here and in the wiki there is a topic or two about that. Basically, disable secure boot and fast start, adjust the clock and keep a manjaro usb at hand because windows overwrites the boot loader when updating sometimes. The guide for that is called “how to restore GRUB” in the wiki.