I've been file sharing since the turn of the century, breh. When I think about it, I could really write a book on this shyt. So making a long story short might be difficult.
But you gotta find a reputable source. Not all encoders are created equal. Also not all DDL sites are created equal. Some are slow as fukk. The fast ones change. Right now, I fukks with zippyshare and billionuploads as my 1 and 2. Putlocker used to be #1 but their speeds have slowed down and now I have them at about 3. Also, some sites make you wait between downloads. This is really a problem if the file is broken up into parts but I try to stick with single link downloads anyway. And not all sites have resumable links, meaning if the connection is severed, you would have to start the download over. Couple that with the wait time and you have what I call a shytty DDL site.
You gotta know exactly what you're searching for. Google the exact name in quotes like this "Movie you want". No spelling errors or of course you won't find it. Put the year in quotes. Include the format you want (720p, 1080p, DVDrip, whatever). And put the DDL site you want in quotes. Like I said, the sites and their speeds tend to fluctuate over time but the more you do it, the more comfortable you'll become.
I would also suggest using a download manager such as jdownloader because that makes it super easy. With that all you do is copy the link to your clipboard and the software identifies the file for you. The UI is a lot like torrent software so you'll be somewhat familiar. You tell it where you want the downloaded file to go etc. That might help because most DDL sites have a lot of ads and that confuses people. You'll see a big DOWNLOAD NOW button but it will actually be an ad.
Once you start finding files you'll learn which encoders you like, which DL sites are the best and you should be bookmarking reputable sites to get files from. Again, all this comes from experience.
Hope that helps.