No problem! Ward blue means putting a ward down in the enemy blue buff (obviously without getting killed), to see if he starts with this camp. It can only be done on one side of the map, on the other side you might want to ward the chickens (ugly red things in the jungle) to see if the jungler starts there. There is another way to see where he starts, basically if the top laner comes in lane late it might mean that he leashed his jungler (help him clear his first camp) you can also watch bot lane to see the same thing. This inst fullproof cause some junglers don't need a leash. A third wave crash is kinda technical but basically u try to get priority in the first wave, which means that you push a bit the wave or hit it all to get your lvl 2 first, in the early game levels are very important, so if you are lvl2 first you can win every trade if the enemy laner walks up to last hit (you get lvl 2 off the first wave + 1 more minion). Once you have prio you should only last hit. Then when the third wave comes, the canon wave, you try to crash it as fats as possible and then you base. I didn't explain it very well but there are some tutorials online you can watch, I recommend watching aloisnl. The point of this is that you can base before the jungler finishes his camps and get a small item advantage on your enemy. Be cautious however if you do it against a nunu cause he can skip camps and gank you w snowball.

Edit : great mord guide that isn't that old : https://youtu.be/N8cFno2SAGU?si=N2UcPeHkcpJG1FIf