It might be worth treating yourself to a basic maintenance book - it can be easier to have that by your side in the shed than a laptop with a tutorial video! Haynes do one, for example, with lots of picture. Have a browse in a good bookshop, and see which one you find the easiest to follow. Also (like cookery books) bear in mind that you want a book that stays open properly when you're referring to it!
I'm terribly slovenly at maintenance - I have a summer daily use bike and a winter daily use bike, and each tends to get the most attention once a year, just before I swap them over.... However if you are better than me, and want to check your bike over regularly, a handy way to make sure you check it all is to work over it in an M shape from rear wheel, to saddle/seatpost, down to cranks and pedals, up to the handlebars and stem, and down to the front hub. As you follow this shape, look for damage and dirt buildups, check bolts aren't loose, and nothing moves except in the dimensions it should - so pedals go round and round, but don't wiggle side to side, and so on. It's a good way to make sure you don't overlook something.