About chains and maintenance...use Google and search. There are tons of info out there.
Like this
https://www.revzilla.com/common-tread/how-to-clean-and-lube-a-motorcycle-chainBut I do not agree about the lubrication as antirust only. I have seen what a dry chain does with the sprockets, they worn very quick, bad sprockets kill chain.
Just go on holiday and ride about 800-1200km, rain in rather high speed, hear the mechanic scraping from chain and see the metal dust . Chain slack goes quicker too. Gear down some steps and WOT not good with much slack.
That's how I broke a DID 530 HDS o-ring chain outside Kassel, Germany 1988, no broken case. Chains are better since then.
I usually spray my chains about every 500km +/- 25%. If I had ridden bike in pouring rain, chain will be dry from grease very quick.
With a working center stand it is so easy to give some lubrication. I talked to a guy that had a small spray bottle of lube in tool compartment and gave chain a spray every time he refilled fuel. Yes, his chain and sprockets had looong life.
I have used Motorex Chain lube
https://www.motorex.com/en-us/moto-line/chain-care/chainlube-road-strong/Last year Maxima Chain Wax
https://www.revzilla.com/motorcycle/maxima-chain-waxMaxima does not look to penetrate as good as Motorex that look like chain original lube and make rear wheel more dirty than Maxima.
Maxima had got very good result in reviews but how dirty or not the rear wheel becomes might have been a too large factor.
My chain (strongest DC 530 chain for multi hp bikes) has stretched more last time. It has 25.000km so 5000 more should be OK. Sprockets are OK too.
I'll go and spray some know, need a coffee brake with lube.

A good way to kill a chain very quick is to use very sticky lube.
Chain look lubricated but is not, only outside. The rollers against sprockets bone dry. A cheap non o-ring chain died that way within 2000km in the beginning of the 80's. Same bike, my K6, not modified engine then but ridden much harder!!
Rollers cracked and disappeared. So many that the links almost came together sideways. Could have gone bad on the roads in my usual 100mph pace.