Hello,
Greetings from Kiran Krishna , an experienced web developer . I have past experience in developing forum / blog websites similar to this requirement . I can see that the Wordpress platform will be a good platform for you to start with tutorials website . I also run some simple blog/tutorials websites previously . Considering SEO also, it will be good for you to optimize your website easily .
I would like to discuss more about your requirement, before we take a decision . We can compare available platforms and select the best one .
Looking forward to hear from you .
Thanks