There are plenty of good ways to transfer LPs and 78s to digital forms. But they all depend on the quality of the source material. So it's really important to clean your records before you do the transfers. The difference in the sound is quite amazing.

Don't just use a dry brush or cloth, but give it a serious washing with a mixture of distilled water, isopropyl alcohol and a squeeze of dishwashing detergent applied with a brush that can get the fluid into the bottom of the grooves and loosen the accumulated crud. Use a soft lint-free cloth to dry the disc after washing.

For 78, don't use alcohol--it will dissolve the surface of old shellac records. distilled water and dish detergent is ok.

Also, use a small artist's brush to gently clean the stylus after each side of each disc. If the needle picks up crud from one record, you don't want to carry it to the next one you play.