solder

Hello all! Love the forum here! As titled, I've taken on teaching myself to solder. I watched every single one of xxxxxx videos on Youtube on soldering as well as a ton of others before even attempting my first one. Went out and bought a few feet at Home Depot as well as some different fittings...

My refrigerator had water supply from a braided stainless steel line that was coming out of a hole in the wall behind the fridge and connected to the copper pipe somewhere in the floor between the first floor and basement. I installed a new water filter system at our kitchen sink and T'ed it...

Seeking second opinions on whether joints/connections look secure. Recently had a plumber do the following: (1) Remove corrugated copper pipes and solder on male adapters for stainless-steel connector. (2) Remove old cold-water supply shut off valve and solder on lead-free copper-alloy ball...