When my mum died, my parents' neighbours were lovely. They would bring around food, or help my Dad (if me/my siblings were at work) and just spend time with him.
I'll never forget a lovely friend coming over when my DC1 was a newborn. I was on my own (ex had walked) and she and her hubby would come with a cooked meal so we could eat together, have a catch up and then they would watch my DC1 so I could have a nap or a shower.
My parents/family were very much people who would help others. When my parents died, so many people would tell us about the lovely things they did.
Likewise, amongst the people I know, if there is someone who is in a fix, the others will club together to help out. Broken washing machine, then a rota is drawn up so laundry gets done. An injury, illness or death, then things like laundry, cooking, housework, lifts, school runs and childcare are done to try and support.
At work, staff have bought small bottles of toiletries (unused of course), hair bands and things like that, and offered them to patients who don't have these things with them. The hospital-issue stuff isn't great, so things like this can make a real difference to people. Staff will also often buy in some packets of sanitary pads and put them in the staff toilets (or give to patients, rather than offering those giant incontinence pads!) so that people aren't caught short without sanitary protection. Things like charge leads for phones we also lend out, so patients can stay in contact with family/friends.
The kind things that people have done for me over the years, and the kind things I've seen, I will try and then do for others/pay it forward, so to speak. I think it's the small things that can make a big impact on people.