1- Auto Q auto E auto and then picking up the Axe then auto Q auto again . with this combo the first part is auto Q auto you can cancel your Q animation with your auto attack animation if you have 1.5 attack speed so you can cast this combos in 1 second . look at my video on where i used this combo and did the most DPS https://youtu.be/ZE4_Qg_17kM

2- Basic Q-E combo . really easy very good in lane and for short trades .

3- Auto Q-E auto combo . very good against squishy champs while R'ing . here is a video on how i did it while R'ing https://youtu.be/T6FCfBBFWzA

4- Flash Q , E Flash , Flash Auto Q auto E . Flash Q-E or Flash auto Q-E auto .

5- Q and then Flash towards the Axe you threw and then Q-E . very good against jax al lvl 3 where he uses E and then you Q and the Flash towards the Q you threw to dodge his stun and then Q-E look the this example i had against a jax https://youtu.be/x-JicZhwONs skip to 0:42 where i used this combo .

6- you can Flash to pick up the Axe while R'ing to do the most DPS for example look at my video on my youtube channel here where i used this https://youtu.be/T6FCfBBFWzA

Olaf main strategy in so use ragnorak to go for the backline and kill them given that you know all the combos and knowning that your playing a hit or miss champ where if you land Q's your on the money and if you miss you lose alot of your DPS and CC slow .

if olaf is ahead you want to ragnorak towards the highest source of damage in that game and then the backline .

if olaf is not ahead or even , then using ragnorak on the backline is the right way or using it to deal with assasins who can kill your own backline .

if olaf is behind or it's late game , then its extremely hard to play the game but again if you can take down the enemy support with you while R'ing then its worth .
Regardless i believe olaf is a situational pick and he is D tier champ now

Early game : in lane you should go over the guide matchups and play the lane from there , olaf is really really strong early game and you have prio against almost every matchup so you could invade with your junlger at 3 minutes into the game or after you shove the 3rd wave if your jungler wants to invade or fight for the crab .

olaf hits his peak strength in the mid-game mainly because your Q slows the most and it does the most damage combined with your E true damage .
you should abuse this by looking for fights when drake is up , and try to look for objectives to take down like mid tower or bot or drake or the rift herald . also its really important to be very good at team fighting and knowing when to all-in and who to all-in .

olaf late game is bad but you can manage it by focusing only the backline in those team fights, if you can take down 2 people with your R then its amazing and worth . but also remember because you lack CC or heavy CC . hyper mobile champs or champs who can go phase rush + ignite can be hell for you . champs like lilia - pyke - qiyana - vayne - kayne - lucian etc those champs , you don't have a straight forward way to deal with them . you have to play it slow and wait for the ability that counters you so that you can all-in from there

because you lack CC or heavy CC . hyper mobile champs or champs who can go phase rush + ignite can be hell for you . champs like lilia - pyke - qiyana - vayne - kayne - lucian - Akali etc those champs , you don't have a straight forward way to deal with them . you have to play it slow and wait for the ability that counters you to be on CD so that you can all-in from there but again you should play with your power spikes like lvl 6 or when you get stridebreaker with tapis or when you have ghost and flash up .

About me: i've been playing olaf since season 5 and never played any other champ i've always been an olaf main since season 5 until now . he is the reason i play this game and i would never change him as my main . my highest peak rank was in season 9 and i got to Diamond 1 thats when olaf was really good and he was a strong champ . currently i dont play ranked i only play norms and yes i am washed up . but atleast i am having fun , i am still waiting for the rework and if it hits the live server i'll update this guide . i also upload video only about olaf on my youtube channel here

https://www.youtube.com/channel/UCTIU9lFrPN6px_1tJ8buhRQ/videos