Hello,
1) I checked and see that you need to add alt texts for your images (it’s not related to theme) and change the colors of the elements https://prnt.sc/219iom5
2) Change the title of the custom font that you use https://prnt.sc/219je9b because it causes the issue https://prnt.sc/219jxce
3) These errors https://prnt.sc/219kij6 are related to Revolution slider https://prnt.sc/219krkq and we can do nothing with that. You can report about issue in the Revolution slider comments area and ask to fix it in the next plugin update.
Regards